Have a hard time deciding if playing/studying high stakes MTTs are woth my while.
I'm kind of clueless what decent, good and great ROI looks like.

Let's say I play:

9 tables simultaneously
Buy ins from $50-$500ish
Most sites, with good tourney selection
Mostley non turbos

What would you consider decent, good and great ROI?
And if you know what the top pros ROI look like, I would be greatful if you would share it.