u should take a look at Ragnarok Mobile Eternal Love

the bidding system for an mvp or rare card...

the money use in the bidding can buy u a real bungalow

in-game currencies, and there is option to bid and how much u want to bid till u get the item... if u look at it, the tense which u will feel in seeing the bid is like so hot because u know each bid is a real money and after it was done, it already reach hundred of thousand real money

lol