sufunk, I understand your frustration, but I'm not sure I would categorize that as a rip-off. Sure, $75 sounds like a lot for an evaluation, but it does involve time and driving costs for them. The cost is also probably there to deter people from "shopping around" for multiple quotes. Who wants to waste time giving people free on-site quotes if they're not going to get any future business from them?
Then again, all aquarium maintenance services are a borderline rip-off, in my book, it doesn't matter what company. The whole service industry is designed to take advantage of people who are too busy, too lazy, or too ignorant to do things for themselves, and have enough money to burn that they can pay someone else to do it. These services are NEVER going to be cheap, because they're viewed as luxuries.
Not calling you back is certainly poor customer service, but I don't think that it's meaningful in whether or not you got ripped off. Who knows what issues prevented them from calling you back? Maybe they were still dealing with post-hurricane aftermath and not returning calls quickly. Maybe they didn't want to mess with a relatively small potatoes 26g tank on a regular basis (I think the $80/month quote reflects this). Maybe they just didn't like you (you sound like you didn't like them very much either) - sometimes personalities just don't mesh.
I've dealt with many business (some by choice, some not by choice) that are really bad about not returning phone calls. Sometimes, if you don't get the person you need to talk to, you just have to keep trying. The squeaky wheel gets the oil (eventually), and you decided to stop trying to contact mark to establish a servcice date.
Asking them to give you a $75 coral to make up for things was a ridiculous suggestion, considering the costs of their time and travel to your house. Perhaps $25-$50 may have been more reasonable, but they really didn't owe you anything. The $75 was paid as agreed on that date.
Your experience does nothing to tarnish the reputation of the lfs, in my view. I would never use them (or anyone else) for service, so that's kind of a meaningless detail to me.