I never said all of my comics are good. However, the ones I post to this forum and invite others to read are the ones I am most proud of. ie- I think they are funny. If I think a strip is crap, the last thing I'm going to do is draw attention to it.
Also, when I'm making strips, if I feel it's really crap, I don't even bother hitting "save". If I hit save for every comic I started I'd be up at 500 or so by now.