rankmaster77 - 9:55 pm on Sep 17, 2012 (gmt 0)
Jabzebedwa has a good point.
You may want to consider the user of your services and extend into niche areas that will help you capture certain clients ($,the need, well qualified), for example: executives relocating & or looking for homes where they can commute to NYC. You'll have to dig in and find these related or associative Keywords, but it may be worth a try. This may help you bid on less expensive keywords for that potential client. Those KW's may be cheaper, yet they let you semi-compete in the real estate market.
In my past experience if you intend to compete, sometimes there are a few KW's that with time, could help you get just enough leads to break even or make money. I am assuming in your field the commission on a sale is pretty good, so you may want to work your way up with just a few good keywords, pay the price for now, get plenty of neg-kw's in and see what you can capture.
You may also want to bid during certain hours where it may not be as expensive, i.e. the wee hours of the night. Just an idea.
Hope that helps! :)