Scam devs are sometimes even too dumb to pull off a scam. And believe it or not but some of them would even scam for a couple of dollars.
In this regard, of course everyone has a different appetite. Ranging from a couple of dollars to several million are now trading scammers. But many people do not want to learn to recognize scams, all want to just have a lot of money without doing anything.
Scamming several millions is risky as you need to do a lot of things that might leave a trail. Scamming for a few thousand dollars and do that again and again probably is "safe".