Personally, they aren't generally worth it to me, but I'll scavenge through garage sales, flea makets, pawn shops, and anything else thank might yield great deals, Dragon Warrior 4 for 17 cents, don't mind if I do, Mario RPG for a quater, SOLD! 70 genesis games all different for 25 dollars,I'll give you 20, (all these are real finds by the way) etc, but not everyone has time, luck, desire and availability to do I do so I understand the price, the vc is convenient and easily manageable, real games might not be (try keeping track of 500 + nes games, it is no easy task)
plus they do an okay job of filtering garbage (though I don't know how china warrior slipped through)
personally I have a few Tg-16 vc games because they are bargains and tg16 games are tough as nails to find and many really pricey (Bonk 3 in particular, easy a 100 dollar game...though I've found 3 in the wild) at 6 dollars they are completely worth the price to me, and some 64 games are because they really benefit from the filtering and stabilized frame rate the vc offers (mario kart 64 is night and day between the original and on the vc)
But personally I'd like to see atari jaguar games hit the vc, and by jaguar games I mean the few good ones and by that I mean Iron Soldier 2
IT is all a matter of perspective, somebody that just want to play a little super c, the vc is way easier than finding an nes, getting a copy of super c, then dealing the with the nes poor fidelity, contrawise I like original carts and will gladly deal with all that jazz