We have a pretty good volunteer base, considering the size of the community. A big dig day might have 30ish people. The fact that there are plenty of riders that never come dig doesn't bother me that much. Especially if they make some nominal donation to the local club - don't have time to dig? Throw $50 / year towards the club that does the work and call it good.
There are, however, a few people in particular that piss me off. Some of the most frequent users of the trail. People that I see almost every time I'm out digging. But they always have some lame excuse as to why they can't stop and help for 15 minutes. And they've been using those same lame excuses for years and have never once lifted a shovel. And they're cheap - they've never donated a penny to the local club either. Fuck those guys.