OK believe or it or not!
Been on the Facebook WGT app a few times and 99% of them are mobile players. The long and the short of it......I was offered coins by a named person, don't know his player name, told me he had over 3 million of them. And two others I had brief conversations with tried to tell me it was the norm??
Really!!
You buy credits, these are paid for with legal currency, these have a monetary value!
You buy coins, these are paid for with legal currency, these have a monetary value!
There was and still is a 'black market' for credits sold via MP, skins, club gifting etc!
Doesn't take a rocket scientist to figure it out!