OK, I can give you an early report. My site has been live for 4 days. Firstly, the stats are fairly meaningless this early on, because there may be a lot of people waiting for eBay auctions to end, and there may be new users who've signed up but haven't yet bought anything (but they may buy something in the next 30 days which will retrospectively add to the stats).
The domain was recently averaging $4/day from PPC parking. In the last 4 days I've made $0.53 from eBay sales plus $5.43 from google adsense. I've been averaging 8 clickthrus to eBay per day, from around 60 uniques per day. So, although I'm behind in revenue, it's early days and there may be new members and sales pending from previous clicks. It does actually seem to work, although it's difficult to know yet if it will match parking revenue. There is the added bonus that I might start to see search engine traffic, which I otherwise wouldn't get from a parked page.
I'll report again in a week