You should know if you charge too little if you have a constant flow of work, or you charge too much if you don't - OR you don't advertise enough or well enough, which if it's not done well enough people will probably expect you not to be able to make sellable banners/sites.
I haven't looked at your stuff recently. Just commenting.
Oh, and do I get something free for bumping/commenting?
Cheers,
Matt