I assume you are envisaging its use as DrSound as in audiologist, A little scout around does show it in use mostly just in Asian Countries. The .net and .org are both being offered for sale for low $x,xxx. I personally don't like the domain but I can understand how a country (probably India) may want to use it for it's basic English association.
I'm pretty sure it will be a difficult sale on the American English market for the sort of price your looking for. Probably doesn't help that a simple microsoft lookup takes you straight to a fraud/scam result at No1. Google however, has plenty of positive associations for products and usage, including English speaking
Bottom line, I think you could be waiting a long-time for at best a $3k sale, maybe years. I think there is enough usage out there for you to step-up and do some OUTBOUND work on this one. Check all the TM databases first. and don't outbound them. But even I can see there are a fair few worth targeting. This may get you the lower $3k your after.
In terms of what you say you paid. So much better out there for that sort of Dollar. I'm lost as to why you paid that.