I mean, like there is no kirby games,one mario,no halo, no nintendo. or sony, or microsoft. what gives. copyright laws or something? ...NO.. look at newgrounds. :l
Developers submit their games to AG for them to be approved and posted to the site. I would assume the people making those games you are talking about prefer to keep their work on NG.
As for the devs of AG, you can't force them to make games of your liking. If you want a game, make it. If you want to play the games here, play them. If you want to play games of popular video games, go elsewhere.
maker = $700 and lot of work. That is why no one here makes those games. If your going to make a game of good value you may as well use your own charecters.
There's another way to play your favorite games here on AG limebreaker10!
Simply go to NewGrounds, contact the maker of those games and ask him/her to get their games submitted to ArmorGames... it would mean a bigger 'audience' for them and an addition to AG!
Have you tried this? If not... there you go! A sure 'Win-Win' situation if you ask me!