as Steven says, there is a lot more to disappointing crowds than just blaming it on apathy...
time of the month (y'ken what I mean...)
night of the week
other gigs in short space of time that can attract similar audience
too may gigs to go to (can be a problem / double edged sword - I know I don't have time to go to every single gig I'd like to, although it's great to have so much choice)
small but defined target market
people have other things to do! (I'm neck deep in DIY!)
it can get demoralising at times - we've had single figures at gigs in the past year, and you're like WTF
