[wongarsu]

Many people will have addresses saved at places they exchanged bitcoins with, like an exchange. And it only takes one customer with proof of stolen funds to ruin their reputation, and with that the whole business. It makes much more business sense to be honest and take the 20% commission, unless someone comes with a wallet with far above the usual number of bitcoins inside.

[tehlike]

of course, you can also imagine someone using a decoy wallet too to see if they are honest. I am not saying they should do this obviously :)