It takes a lot of skill and practice to sac a piece for adaquate compensation. I used to do it all the time (how else will you learn?) but it needs to be tamed and timed when it's called for.
The most successful sacs that have worked for me are rook sacs.
My favorite kind of chess.com player.
The guys who think they are Morphy and sac all their pieces thinking they will mate me.
Beating patzers when drunk = priceless
http://www.chess.com/livechess/game?id=1140054400