There was no "guaranteed" buybacks.
This is outrageous lie:

source:
http://web.archive.org/web/20170809030225/http://betking.io/You lied to investors then you fucked them:
Yes, Dean, you're right.
My 0.5BTC investment IS worth 528$.
Now you are making some token swaps/whatever to fool more people. I would suggest everyone to read this thread from the beginning.
Nice post. It clearly reputes Dean's point a few posts back about the token being a business loan. It's pretty clear the pricing is such that it's structured as a personal loan to Dean, fixed in USD with betking *revenue* offered instead of an interest rate.
It says BetKing will offer to buy "up to 10%"
lol, nice attempt to weasel out of the deal. The "up to 10%" referred to if a user had X tokens, they could use "<= X/10" for buybacks.