Everything we do is online proofing.
It really depends on time. If an e-pic session is rockin', then I keep shooting if my schedule permits.
The longer I'm booked for a wedding, the more photographs I take. For 8 hours, I average 685 frames.
I learned from an old-timer that the more frames you shoot, the more prints clients want in their album - which means bigger album sales. However, I discovered that clients can become overwhelmed with too many photographs, and they never get around to ordering an album. The sweet spot I found is around 700.