But that's the definition of a scam. It isn't just: "take a bunch of money and disappear with it all."
Lots of cons and frauds run with some getting return - maybe big return. That's how they stay in business.
It's called partial reinforcement scheduling. If you want to keep 50 sheep at the fence, feed two some grain, then stay in sight of all of them, and they'll all stay, hoping they get theirs.
What you are describing is a Ponzi.
A scam is, most often, where everyone gets fucked.
BFL is certainly a Ponzi, and i suspect before too long they will pack up shop and move to Costa Rica, or the FTC will kick down the door and seize everything.
Either way, i feel like i got bent over the table.