I think you should be able to rent guns instead of buy, but for a longer time like a month, and to buy you have to spend either lots of in-game points or a bit of money.
But what in win in the tournaments should be permanent. Its really unsatisfying if you win something in the tournament and you don't even have the class.
Please make this happen because this is my favourite game, and I like the system it had back in the beta.
 "Ballistic"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Kingdom Rush"){kind=icon}
Soon! Sorry, it needed tweaks. But soon!