Is 8ball pool of miniclip haram?

Assalamualaikum my dear sisters and brothers. i have a question regarding 8 ball pool from miniclip. its like a virtual game of pool but players stack up virtual gamemoney and whosoever wins takes it. iknow this form would not be haram ( as i read a similar question before) but some players buy pool coins for real money and sometime these pool coins can be earned by the player! please inform me about the second issue please thankyou in advance