Im more doing this for motivation.  Its 100 bucks and will make it fun.  If I win, awesome.  But if I stick to it, make progress, and someone else here does a better job and gets their health moving in the right direction, Ill be just as happy for them.  
Im 6'2-6'3ish.  Right now Ill probably step on the scale between 213-220.  5 years ago I was as high as 249 and got that down to 198 over some time.  I got back up to 225ish, back to 205ish, and now sit here around 215.  I dont expect to win, would love to hit 195 but dont think I will.  I do have a few other things that will help motivate this year.  I plan to try my first Tri (ill do olympic distance).  I could complete all portions now (1 mile swim, 22m bike, 6.2 mile run) but I dont like just completeing things, I like competeing, so want to train for it.  Also, I am getting married at the end of October. Wouldnt mind being able to say I am in the best shape of my life at that point.  FWIW, I turn 35 next month, so metabolism is not on my side.