I have a miniclip ID that has a total of 100,00 coins on the game "8 Ball Pool" for iOS, Windows, and Android. It has a win percentage of 59 with 330 of 555 games won.
I doubt an account like this has ever been on the market, and I don't know who would be interested to be honest. But the game has a very large amount of people playing on a regular basis (about 100k) and the shop for game (where in app purchases occur) has 100k coins vauled at $100. It's also a level 23 account.
The game is server sided, meaning in app purchases cannot be gotten around, everything has to be earned legitimately, or actually paid for.