I've spent some time in the past on MyFreeCams (never bought any credits, just watched).
From observations:
3/4 of the women there seem to be Colombian etc. and in studio sets or whatever they're called. endless stream of these ranging from "wouldn't touch that with someone else's bargepole" to "FAF".
A lot of women just sit / lie there fully dressed looking completely bored, playing with their phone etc., wanting 200 credits to "flash boobies", "400 for pussy" etc.
If someone is dopey enough to tip, a lot of the time they get a 1 sec flash with zero smiling, thanks etc. and the girl goes back to looking bored stiff.
The ones that seem to do fairly well engage with their audience. I've seen some raking in 1000s because they're smiling, chatting with everyone, and making you feel part of something. Some aren't even unclothed and rake in $$$$$ just because their friendly and take the time to be social rather than some miserable cow expecting $$$$$ just for being there.
It's not really the nudity that seems to draw in the cash. I've seen some that are totally gorgeous, naked all the time, regular cum shows yet aren't that popular.
Others, who as I said above, make you feel welcome, part of things, with an old friend who you can chat to for hours, and so on, don't need to make any real effort to get naked and do sexual things.
I've seen someone fully clothed changing her socks and making more in 5 mins than a top escort in a week!