That's about what I made mining with it overall before the limit approached zero. Maybe twice what I paid *if you count cash dollar values only (keeping the BTC I spent would have obviously been a much better deal, if I held them til today!)
This worked better than it would have otherwise, because my employer had electricity priced into the rent at a flat rate, and told me he wouldn't mind if I threw these things into the server room.
(I got two early batch and four 10GHash later on for a total of about 50GHash. I don't remember exactly how long, but I am sure I waited a lot longer than 5 months.)