I did several Internet gigs at the start of the 2000's.
The Kashmir Club was a small venue in London and when they added an internet broadcast to the gigs we came in with our original songs. It was OK, a bit like playing to a few people in your front room, but not a patch on playing to a room full of real punters though.
There's nothing like reacting to an audience, from a sit down gig to the banter you get with a sweaty bunch of herberts, to get the performing juices flowing.