It might seem like a silly reason, but this bit from a 1991 issue of EGM sums up a lot of why I find portable clones interesting and exciting. Even back then there was an awareness that portable consoles were a cool idea. That part of me that got excited twenty years ago by this never released portable NES is the same part that gets hyped by these new devices that fulfill that original promise. They aren't mean to be the final and best solution to playing these games, but they do deliver options and avenues not available with original hardware -such as portability, or wireless controllers (speaking specifically to the FC-16 Go, which got that aspect right).