I do not understand how they are too basic for their price when they are far an away more advanced than the SNES games. Take Link to the Past for example. They ported it, and even added a multiplayer aspect. They upgraded Final Fantasy IV, V, and VI, created one of the most renowned strategy games, made Castlevania games up to par with Symphony of the Night and Metroid games on par with Super Metroid.
I really fail to see your logic, especially since you are a Nomad fan and many Genesis games have been ported/upgraded to the GBA.
Did you miss the part where I said "up to £25"? I could have a PS2 game, or even an Xbox 360 game for that price. How many Genesis games cost £25? Seeing as I have a Nomad with games barely more than £5-8, why would I then pay £25 for the same game with a few little extras?