Sounds like you need
highly targeted advertising. What are you promoting?
With 81,000 impressions you should have at least generated the industry standard of 1% or 810 clicks. Out of those 810 clicks you should have converted at least 8 sales or 1%. Obviously those are not set in stone and rely on a variety of factors but those are the general numbers.
I experimented with bidvertiser for a while but was also unhappy with the overall results. Strictly Adwords for me until a better solution comes along.
Also try testing your ad copy some. For launching better PPC campaigns I recommend you investigate
Perry Marshalls: Definitive Guide to Goolge Adwords . (no affiliate link)