Why would someone pay $300 for this when they can get a PS4 or XB1 for $100 more and play better games and get a better experience?
Because games for consoles cost you $60 each 1st. 2nd, you can use GRID, which even if priced $15/mo is only $180 which equals what, 3 xbox1/ps4 games? You can pound through FAR more games for that same price on GRID assuming $15 or less for 1080p streaming (likely under $10 for 720p, maybe even free who knows). Add streaming your entire PC library (if you have PC) to the TV with gamestream (your whole steam library on your tv), and on top pricing on Android games are $2-20 with many great ones in the $2-5 range. For people who haven't played even the ports previously (on pc or consoles I mean) you can get full fledged games for $2. IE Bard's Tale ($2). Baldurs Gate 1+2 enhanced ($10), Icewind Dale Enhanced ($10), Star Wars Kotor ($10), halflife 2, portal, serious sam 3 bfe, doom3 coming soon etc. The most expensive games are from EA/Square with all the Final Fantasy ports etc ($8-15 or so) but again full games for people that have never played these anywhere else previously. Most of the ports sold between 5-20mil units, so there are a TON of players on mobile who've never seen these games.
Current android games are pretty great anyway with a huge list of stuff I'd like to play:
Order & Chaos Online (cheap WOW substitute 2GB game) Dungeon hunter 5, Ravensword, Modern Combat 5, Gangstar Vegas, Asphalt 8 airborne, Nova 3 Freedom/Near Orbit, etc. They are amping up on mobile now. MY list is getting longer every month and this is just a small portion (dungeon hunter 4 etc look great too). None of these are made for K1 yet, so with the 14nm chips coming we'll start to see games aiming more at K1/X1 levels of gpus on everybody with the next crop of games.