What kind of airdrop which itself asks to buy a coin ... it's funny .. it seems like a scam, it's not known at which round of airdrop the developer will run away with money .. Stop fooling people. otherwise soon be in the prison .. this is my advice to you ..
The best kind of airdrops are the ones where you are required to hold a certain amount of coins because they stop people that have hundreds of BCT accounts mass claiming the airdrops. Maybe that's why you are calling it a scam because you wanted to scam the airdrop but you couldn't.