some of the things that motivate me are:

To be able to play with my son more easily (and I know it will only get tougher as he gets older and more active - bike rides, roller skates etc).

To be able to shop in 'normal' sizes- -good bye Lane Bryant etc

To be around for a long long time so I can watch my son grow up and one day be able to enjoy my grandchildren. (that's a LONG time away since DS is only 2)

To be able to go to Disney World and not worry about if I fit comfortably on all the rides.

To be able to go horseback riding again.

To be willing to get a picture taken because I know I won't completely hate what I see.

Lots of reasons. If an external prize was 'offered' for it, based on the OP, I'd probably be motivated by a financial reward OR a trip - as long as the trip was somewhere special and not cheap. LOL But the real reason for losing the weight is for me. Not for a prize. Not for someone else (well, it IS for my son and hubby, but that's so I can be around for them - which is still for me!)