Don't listen to 'em homie. If you know your shit and you sound like you do, do it. But personally when I did give a fuck, I had a 2 degree bevel on the bottom, and my edges were sharp as shit, and never caught.
AS FOR THE REST OF YOU SILLY PARK MONKEYS THAT DON'T KNOW SHIT ABOUT TUNING SKIS. A bevel is when you, well, bevel your edges, meaning theres a teeny tiny little tilt to them. If it's done correctly. It's sweet, you can rip all over the mountain, get to the park, do sweet carve 540's and then grease a rail like nobody's business!