Well, regular tanks are also more appealing to me aswell. Another thing is, regular tanks keep clean easier and always look brighter and cleaner. With Hex and Tall tanks (I've had a few) the water looks dingier since they are taller and the light doesn't quite reach the ground, plus HOB filters seem to have a harder time cleaning them.
I agree with Kasakato, even a bowfront is harder to light then a regular, and to me darker tanks aren't appealing.