So what should a broker actually do instead?
Use the fast money to buy time — then actually spend that time building growth that's yours. The goal was never to refuse books on principle. It's to stop mistaking them for a foundation, and to put real, owned assets underneath the revenue while you still have the runway to do it.
Here's what that looks like in practice. Not theory — the actual moves, in the order I'd run them.
Turn one-time books into a partner channel you own
Instead of a smash-and-grab hire, build a real IB and partner program. The difference is structural. A poaching hire is a single transaction — one person carrying one list. A partner program is infrastructure: a tiered commission structure, sub-IB layers, a partner portal, reporting tools, marketing assets, and support that partners actually depend on. Even when individual partners churn — and some always will — you keep the rails they ran on. You own the CRM, the payout system, the brand they operated under, the tools they got used to. Make your partners a little bit dependent on your system, instead of making your whole company dependent on one partner's goodwill. One is a channel. The other is a hostage situation you volunteered for.
Convert borrowed relationships into owned ones, fast
The moment a book arrives, a clock starts. Every trader on that list currently trusts a person, not you — and you have a narrow window to change that before it hardens. Your job in the first 90 days is to migrate that trust to the brand. Onboarding that actually shows off your platform. Support that answers faster than their last broker ever did. Education, a community they join, product features they start to lean on. If a trader's only reason to be with you stays "Budi invited me," you will lose them the day Budi leaves — guaranteed. But if their reason quietly becomes "withdrawals are fast, the platform's good, support actually picks up" — now they're yours, and Budi leaving is survivable. Most brokers skip this step entirely and just bank the commission, which is precisely why the book always leaves fully intact.
Build the assets nobody can carry out the door
Brand, trust, product, conditions. These are the non-portable assets, and they're the whole point. A departing employee can take a contact list. They cannot take your reputation, your licence, your execution quality, your withdrawal reliability, your content, or your community. In a regulated industry, trust is the deepest moat there is — being genuinely reliable, with a clean licence and money that comes out the moment a client asks for it and no games at the withdrawal stage, is a retention asset no competitor's better commission split can match. It's slow and unglamorous to build. It's also the only thing here that compounds instead of resets.
Stop optimising CAC, start optimising retention
The book-buyer's favourite metric is CAC, because buying a book makes CAC look spectacular. But CAC is a vanity number if those clients churn the second the relationship-holder walks. The metric that actually separates real growth from borrowed growth is retention — cohort retention, churn rate, lifetime value. Track how long clients stay after the person who brought them is gone. That one number quietly tells you whether you're building a company or renting one. Then move spend accordingly: away from acquiring the next book, toward keeping the clients you already have through reactivation, loyalty, deposit frequency, and removing the reasons people quietly leave.
Make the company own the client, not the individual
Don't let any single person be the sole owner of a client relationship. Use team-based servicing, house accounts, a CRM that belongs to the company, shared coverage — so that when someone leaves, each client still has two or three other touchpoints with your brand and doesn't feel abandoned into following the departing person. And for your genuine builders, the ones creating real value rather than just carrying a list, give them long-term incentives, a real career, maybe equity — a reason to stay that a competitor's "just bring your book" message can't easily beat. You retain good people the same way you retain good clients: by making staying clearly better than leaving.
If you do buy a book, run it with a migration plan
Buying a book isn't the sin. Buying a book with no plan to convert it is. If you decide to take the bridge — and sometimes that's the right call — set a migration KPI from day one. Within six months, some clear percentage of those traders should be showing company-loyalty signals: actively using the platform, in your community, transacting independently of the partner who brought them. If they're not, you'll know the bridge is collapsing while you can still do something about it, instead of finding out the morning your top partner resigns. Treat every bought book as a relationship you're in a race to make genuinely your own before the lease quietly runs out.