For Reversi, the sales have always been rather low (it settled into approximately a sale a day after the first couple of months), but the Lite version does brisk (free) business. There's 463 installs so far this month. The usage statistics we collect show that the full version gets quite a few less plays as well, but does seem to hold players attention for longer. If I had more time I'm sure I could make better use of this information.
P.S. Other developers have mentioned to me that they've gotten better results for games, but not by huge amount. I suspect until we see some next generation (using 3.0 SDK) games from Roku that get users used to buying games, there won't be a huge draw.
-- GandK Labs
Check out Reversi! in the channel store!