Steam - the popular gaming community - does not support Bitcoin anymore. And the reason is simple... It's getting too expensive.
I quote:
"In the past few months we've seen an increase in the volatility in the value of Bitcoin and a significant increase in the fees to process transactions on the Bitcoin network. For example, transaction fees that are charged to the customer by the Bitcoin network have skyrocketed this year, topping out at close to $20 a transaction last week (compared to roughly $0.20 when we initially enabled Bitcoin). Unfortunately, Valve has no control over the amount of the fee. These fees result in unreasonably high costs for purchasing games when paying with Bitcoin. The high transaction fees cause even greater problems when the value of Bitcoin itself drops dramatically."
Steam started accepting Bitcoin payments in april '16. At that time the transaction fee was about $0.20 - but with the increase of worth the transaction fees are now around $20. They may re-evaluate future use of Bitcoin (or other cryptocurrencies).
Source: http://steamcommunity.com/games/593110/announcements/detail/1464096684955433613