To the posts above stating buying gold.
This isnt how free to play games work, successful ones atleast, usually people buy skins, that right there is the biggest premium currency money maker for the company.
The second on that list is usually boosts, though they are usually timed boosts not per game boosts, something you might want to look at MSE. 12 hours + 1 days boost would go along way over the current system. just make them buy only or a super rare reward. its always been pay to go faster with free to play games.
Currently as i see it, buying gold with premium currency is completely unworthwhile, for £20 you get roughly 175k coins, that isnt enough to buy a character for the most part, so your looking at maybe £25 for a single character? i've bought characters legendary skins for less in other games and those are not considered cheap by any standard, heck some of the rarest skins in those games, have cost less than a single character in this game premium currency wise.
i get you guys want to make some money, but the way your going about it, isnt that great. Considering this is the 3rd "relaunch" of the game, might want to make it a little less expensive for the consumer?
playerbase is averaging 100 per day atm, the way i see it, without massive changes to the system its going to die at some point. i can see the amount of polish put into this game, it far out does many many other free to play games, though they are doing much much better, both playerbase and economy wise.
That said, im having some of the most fun in this game in a long time, especially the boss fights and would hate to see this die, i just feel with a little more thought into the games premium currency you could see it rise much further than its current standing.