Just floating an idea I have for my own website.
All arcades on the internet take a very large slice of the advertising pie. I propose to undercut them, I will take only 10%.
If php's LCG outputs less than 0.1, it will insert my adcode into the page. Else, it will insert your adsense adcode into the page.
PHP's lcg's properties are random enough for non-cryptographic use, such as for this. The LCG is seeded with the process ID and the microtime.
I reserve the right of review, and the only way you could send me your game is by a zip of the exported game.
Obviously your game will be displayed within an iframe, and the iframe must be of a reasonable size. This is obviously oriented towards desktop HTML5 games.