So, here's an interesting promotion. A press release just hit the ol' Joystiq inbox, claiming that those who buy all of the Xbox Live Summer of Arcade titles will be treated to 800, also known as $10 in Microsoft's funny money. This calls for copy and paste!
Just adding those up -- carry the one --- that's a free $10 for spending $70 on Xbox Live. Keep in mind it's $10 you can only spend on Xbox Live (or Zune Marketplace). While the deal might seem silly at first glance, it does essentially boil down to five XBLA games for $60, the price of one retail game. And, as another Joystiq editor pointed out, that retail game could never be 'Splosion Man.
It's a nice bonus if you already plan to pick up all the games. If you don't, you'll be saving money anyway. Everybody wins!