Sounds like you don't understand how bustabit works....
Okay. If you want to explain what I'm missing then go ahead.
If you have everyone playing to be competitive then it shifts between +ev and -ev because of the bonus & people dropping out/in. I'm not sure what's wrong with that idea.
I mean, you will most likely get a ton of people
never cashing out but you can also consider the main issue with that strategy: a finite bankroll