These are easily my best gigs. I started doing them a few years ago and I get more of them each wedding season. I will not play entire weddings- there's too much BS involved.
I have 4 cocktail hour weddings lined up though this summer beginning this Saturday. I literally play 60 minutes for $200 and I'm out. If the wedding and reception are at the same place I'll gladly play a song or two for their ceremony.