Hmmm they have a thread in 2+2 where people say they've received bonuses with (seemingly) randomly varying amounts... the one common factor between them all appears to be that they have contacted FTP support for possibility of rakeback on their accounts, and have subsequently abandoned FTP for a while.
So it seems that FTP is rewarding their least loyal customers to lure them back to the site, and all the "Iron Men" can sod off