For the record, that's called "domain tasting" and although everybody complains about it and loaths people that do it, many people do it anyway.
Most of the time, it's huge corporations that buy up all the good ones in this manner so that you, the little guy, never get a chance.
Odds are, the domain you are tasting has been tasted and spat out already.
Don't get me wrong, there is still opportunity in this business... just not the "walk along the beach and trip over a Pirate's Treasure" that it was in the late 90's or even the early 2000's.
Good luck,
GoPC