If you accept a gambling company as your sponsor, surely this is a logical extension of that sponsorship, just as much as if we were pushing Tallon pens, Subaru cars or Granada bingo. The sponsors are paying to spread their profile and increase their customer base, and the club are offering that service to maximise their revenue.
The question of whether gambling operators should be allowed to advertise in football is a different issue really, albeit one certainly worthy of debate. Just a question to you FP though - would you rather we had no sponsor than have a betting company as sponsor? I'm not sure how much we get from that sponsorship, but unless it was significant I wouldn't be too concerned if we did without, but I guess it would give SISU even more reason to limit investment in the team.