In what way would it be different for now? ppl arte already paying real money for dinos and bases.
I think there is a real problem before that reason of ppl buying for real money.
lets think this currency system a bit further... in which way should the player be able to earn money? Maybe through quests, or implementing a new resource and smelt gold to gold coins or by killing Enemies (NPC'S)? IF there where an auction system you could by dinos and BP'S but what next if you have all you need the money will only grow .... so for a good currency system there should be something that keeps the player spending there money.