I see a few posts like this once a week on Craigslist - what is their business angle for scalping BTC?

I see these ads on Craigslist all the time. Will buy BTC for market value. Will sell it for a small commission fee. "Text me and we'll meet at Starbucks" is what some of them say. Outside of it feeling kind of shady, I'm actually wondering what their business model is.My presumption is that these are the folks that sell BTC in exchange for gift cards with high markup online. Or is there a more legit business? And who the heck buys BTC off of Craigslist?​https://bit.ly/2FwtAeX via /r/Bitcoin https://bit.ly/32r7SSt