Why are people requesting PS/2/3 and Xbox games?
Can these be removed so votes aren't wasted on them?

You're not the first to post a thread about this. Then again, this one was pretty shit, so you still come out on top.
I voted for LittleBigPlanet on GOG.

Because GOG is apparently the only place in the world where people can buy games.

I suspect they don't even look at the list themselves. They probably just use it to show a company that there is interest in their game.

Oh it will be... it will be!
Muahahahaha!

Because people are dumb. Since when is that news?

Wasted votes?
Here, I'll give you a couple more to use on any games you see fit, apart from those you've already voted for, to make up for accidental misvotings. Actually, take as many as you want.

In my opinion, it's completely acceptable to vote for LittleBigPlanet to come to GOG, as it is one of the greatest games ever made. LBP and Zork are constantly fighting over a fiery chasm that looks a lot like that giant bridge in Moria to see who is the greatest. Love can go to hell, because Sack-People conquer all!
However, every other console game should stay on the consoles. Unless GOG wanted to open up a console division where they would send out DVDs of console games for a price that would be about twice as much as what you pay now for computer games. I'd buy from there.

Nothing is really impossible in my opinion, who knows what method of emulation might be available in the future. I doubt anyone back in 1993 knew that SCUMM VM would be about.