Can't say I'm surprised to see it up on eBay. A lot of the VGA stuff seems to go there after the first person gets it graded to sell for lots of money.
I sort of get the VGA thing. I mean, I have also collected both cards and action figures for a long, long time and that sort of stuff is common in those worlds. Having said that, I don't like sealed collecting in video games, so... yeah. I also can't say I own one graded anything for my other collections, although I do have a bunch of brand new action figures -- the difference to me though is that they look better displayed in packaging (usually) than they do out of it, so...
If your deal is that you want to grade it to look at, then great -- grade it and look at it. It's your stuff. This is just weird though -- I don't know of anyone who likes to check out their cart's internals all the time. We'll see if the game sells or not, and we'll see if it was worth it, I guess.