Upload & Sell: Off
Assuming you're shooting by yourself, Would you ever begin editing/culling during the reception, while guests are dancing/drinking/partying?? PERSONALLY I would never want a client or guest to look around and be like "where the hell is the photographer??" while I'm off editing somewhere....or, a guest walk by, see me NOT shooting, and then later, when some huge part of the reception was missed (or even some minuscule detail), they think "well that guy sucked" and tell all their friends....
I think every wedding a guest says to me "man you worked your ass off today!! You were everywhere!"
I know some people "stop shooting" when the dancing starts....Just wondering your thoughts...no right or wrong answer, btw...