Nope, not going to do it.
If I follow you it's because:
1. I like your art
or 2. I have chatted with you/met you somewhere and consider you a friend.
Trying to bribe me with the off chance that I might win your raffle isn't going to get me to follow you. You want me to do so, you need to meet one of the two criteria above.
Link
Hendikins
Just blacklist the raffle tag. Problem essentially solved (I've been extremely particular about ensuring those raffle journals are tagged correctly).