I really liked that you have chosen a different method to select the winners of this promo, but your current system may not be fair. Because abusers can easily create multiple accounts in btcgosu and give like to their own winning post. Even some users will give like to their friends/known people winning post rather than the good and deserved one. Which is known as nepotism. The prize pool isn't small. So there is a high chance to see a significant number of abusers who will try to manipulate the voting system with several btcgosu accounts.

BTW, I have seen the rules where you said
“We reserve the right to refuse entries for this contest”
It may create confusions if you refuse to pay someone with highest like. Currently the winner selection system is