No I do not think the price increase is because of steam to be honest, I really do not know how the price increase has come these days.
I hope it will stay around the 500 dollar.
I think because of incoming block halving and i think the price increase because of more investors from lisk and ethereum are converting there altcoin back to bitcoin..
I agree with the first argument about the block reward halving. The Etheruem price is also an all time high.
Both bitcoin and Ethereum are competing to see who has the highest rise, so far, bitcoin is winning the race.
Yes this is the time to hold both bitcoin and Ethereum and see both are rising.
This rise is off course not due to the steam adoption but due to the halving process on the way IMHO!
Steam have very little to do, with what is going on here... but I figure people would buy more games, if they made more profits from the currency value going up. If you bought at $200 a year ago,
and you sold now at $700+ ... you could buy a couple of games as a reward for your efforts.
....Come to think of it, I still have to buy some birthday gifts and some games from Steam would just
be the thing to do while the price is high.