Thing is, there's plenty of Premium games exactly as you describe - it's all I play on mobile or tablet - but they all cost on average between £5-10. Many are ports, some are free to install to play the first couple of levels and then you unlock the game with a one off purchase. The only thing I own good enough to play games on is my tablet and phone so I know this the hard way, but quality is out there, it's just hidden away.
Anyway, £60 is a big step up from the usual £10. I think the Final Fantasy/Ace Attorney ports are about £20. Usually the cheaper price to my mind is that you're playing on a smaller screen and with a touch control system that doesn't always suit the game you're playing (although it can improve certain games - Cultist Simulator, Kingdom Two Crowns and Bad North all feel like they work better with touch controls for me but that's more a genre thing)