Bribes - What Kind of Mother Have I Become???

I never thought I would be the kind of mother that would bribe my children to do the simplest of tasks. Today I realized that I have become 'that' kind of parent. The kind that will whisper quietly to their child, 'We can go to grandma's after if you behave nicely' or 'If you don't give me any attitude when it's time to leave(whatever fun event we are going to), you can have a surprize when you get in the car.' When did this happen to me? It's not all the time, but it is often enough.
My 4yr -K- just started gymnastics. I'm super excited because she loves it, but also because I know she is going to be on her best behaviour for the next 10 weeks.