I got one of those once. Had it for about 2 years and then they banned me without any explanation. How do I know they banned me? Because all profile related actions (login, logout etc) suddenly became a 404 for me and no results would be returned. The 404 issue was resolved as soon as I deleted my cookies, but of course at that point I could no longer login either.
Edit: now I remember -
I wrote a gm script to load multiple pages of results into a single page because I wanted to see 5 pages at a time. I can see why that looked like scraping.
I emailed them a few times and was ignored.
It was still a pretty good deal though.