He want to make people interested to lend him money by using this "fake private keys" or he might want to sell those fake private keys at discount rate.
This can be solved by not buying the private key and hiring an escrow as a mediator. Let @OP transfer the funds to the escrow. In this way, all the doubts and accusations will be solved. We will see whether @OP is a scammer, a fraud, a liar or not. It is wrong to jump into conclusion so let the suggested process tell the truth.
On your question @OP, morally speaking, It is wrong to spend other people's money. I bet if what you are telling is true, the fund will probably end up on a gambling platform. Better resist the temptation. You can always ask your relatives and friends for financial help. I am sure some of them will lend you a hand.