Even if you take a game and claim it's under the respective owner's copyright, you are making a profit from the game without permission of the game owner-- hence forth, this can be taken under the hands of jurisdiction and in all seriousness, litigation.
If you plan on hosting the game like respective sites such as armorgames.com, you will pay the game maker and ask him/her to sign a W-9 form.
What you are doing however, is taking the games off the net, most likely from newgrounds, and distributing it, linking it back to your site, and making a commercial profit from the games, without contacting the game makers or asking for approval.
For instance, my game http://www.games4work.com/games/pla...Flash_Game.html
is under the creative license-- where you can distribute the game as I've given Newgrounds the right. I allow Newgrounds to place my game up in a mutual benefiting relationship. However, on games4work, there has been no hits to my own website and yet games4work is making a commercial profit from my game, without my consent.
This is the license of which my game falls under... http://creativecommons.org/licenses/by-nc-nd/2.5/
Also, my game is under copyright by the US Copyright office.
Unless you wish for me to take matters to a whole level of seriousness, please provide compensation or remove the game from games4work site. Don't give me the bull regarding how I should be happy my game is hosted on "such a great site." Must I reiterate how it has provided my own site with no referral hits?
Once you are making a profit from material that the owner specifies is not free-ware, you are stealing.