i've used wannabee MM models, or at least tried to. The few that were set all flaked. I gave up on them and went back to street shooting.
Yes wasting time and money on flakes is depressing.
These were MM models. I can't afford/won't risk $500/session or more that pro models charge. Therefore, I'm stuck to looking for folks who are willing to work within my budget. I've actually had the best luck and best results from working with folks who will pose for free.