I only charged 350$h until very recently. If you have certain expectations you have to tell the SP before, not everyone wants the same thing.
Also, it's very clear in all my ads that I offer a GFE service.. not PSE, even if I offer cimsw, cob and cof. sometimes people don't read carefully and it causes problems because they are expecting an experience I just don't offer.
Same.. it makes me sad when clients are disappointed but I wish I knew exactly what went wrong so I can get better in the future..