What would make you quit?

[Texas Aggie]

I'm talking about situations on the field or directly relating to what we do -- not necessarily family situations. I'm preparing some training and want to do some research on certain topics - and this is one of them. All of us have a breaking point somewhere and I'd like to know what some of those points are.

For me -- I honestly couldn't say right now. My wife has never hinted that my schedule bothers her and there's no other family issues. I've had friends quit because they didn't want to take any more abuse. What about pay? Injury? Time involvement? Whatever.

Thanks for any responses.