Price sounds ok, but depends really how much 'rubbish' you moved (ive seen sheds ramed to the roof with junk and property with bags upon bags of rubbish), how dirty the property was, furnished or not etc.
You say you didnt inc carpets, though did you inc oven clean, outside windows??
If you havent already, get trained up and get the correct equipment for carpet cleaning. Please dont go down the 'cheapo' route and use diy hire equipment-big no no and can be disatarous (and also give your business a bad name). Alternativley you could sub the carpet work out and take a cut, at least untill your ready for it.
All the best.
J