Why? Because Yahoo boys have money, and Nigeria's per capita GDP is right around $3,000 USD per year. Some Yahoo boys can make that much money, or more, on a single successful scam. It's no wonder Ibrahim got drawn in:
"My friend was having a matriculation party in the club ... and when we're in the club [we see] these guys are wearing things we only get to see in music videos, spending money like it doesn't have value. They were just buying the biggest drinks and everything. I was there because of one of my friends, just to support him I was at the club, enjoying. Those guys were friends to my friend and I kind of told him to introduce us. We just arranged to hook up and he said, 'Come by our place sometimes.' They introduced me to the game. They showed me the in[s] and outs."
"This is a social security check. You'll be seeing a lot of these."
These Yahoo boys all lived together in a giant house run by an older boy who trained them, provided the food, kept the lights on, and generally handled all the adult stuff so that the others could really hunker down and focus on scamming the Golden Corral money right out of the elderly's pockets.