How many of you have gone to a singers night and sat at the back to find that no-one got to their feet and you were treated to a sea of backs of heads and didn't even know who was singing ... and the sound was muffled anyway because you were behind them.
Personally I find it very rude if singers don't go to the front and stand and face the audence. You cannot breath properly or project your voice if you are sitting down ... nor can anyone at the back see you.