20 bucks worth of donation for access into the classifieds posting sections isn't that bad of a deal when you stand to probably make a lot more than that in what you're selling; and if you sell there enough it becomes a bargain after a few sales
[Moderators Note: The ETSG classifieds are a pretty good deal for folks actually wanting to sell things. For musicians, by musicians is the keyword there. As was noted, if you sell a few small items, literally, it has paid for itself compared to other online places.]