I like Microsoft's sales most of the time. I wish they'd make a bigger effort to coincide with holidays and vactions, though. And they should really start offering some DEEP discounts (like at 8- pts or so) of some of the Arcade and content back-catalog.
I do kinda hate it, however, when they put up sales on similiar content, during the same week a new, similiar arcade game is coming out. It forces "either/or" situations, when I'd prefer to be able to get it all.
I always wished they'd do occassional "early adopters" sales, though. Such as bundles of the weeks releases, available that week only, for a discount, or offering a new game for 25% off if you buy it the first day, or something. Or similiar to what they did in gameroom, with mascots, offer free avatar item downloads with first week purchase of the game.
As big as the marketplace is now, there's just so many little things they COULD do, in order to drive sales. But at least they DO seem to be getting better at it! The monthly permanent price-drops they've been offering throughout this year are a good start, but I wonder why they're so hard to find (only through a dashboard ad?) Why isn't there a section for these under the "Games" or "Arcade" download tabs?
Oh, and the XBL Rewards and Bing Rewards programs are pretty nice together. I've gotten a decent amount of kick-back, and 400 pts from searches on bing occur about monthly. so about $60 of XBLA points a year for using some search engine really isn't all that bad...