Actually Apple explicitly recommends not to give them bad publicity whenever a review doesn't go well. After what i realized, and given that i had a happy ending, forgive me for not taking any chance to piss them off.
It's a business application, doesn't have anything particular, and doesn't rely on fancy technological tricks, api or marketing tricks. I believe the reason they rejected the update was for a particular wording in a description that made them think i was tricking my customers (although i'm still having trouble understanding why).
Which would have been forgivable, if that was my first release. But it was just an update, and the part that got them triggered hasn't changed since day 1. The app makes something like 10k a year of profits, so it's not big, but if it were a scam, it would have been reported before...