plumbers must be asked directly what they charge hourly and if that is in addition to a service charge. The two are separate and I think they have gotten away with outrageous charges because of the potential of water damaging homeowner structures. I had a plumber (not Home advisor) come and replace a part in my kitchen sink that was under warranty---the spray nozzle had been leaking...He charged me $85.00 for 15 minutes of work and I will never use Mr King again.
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When a person has a blockage in their sewage system they often try to fix it themselves by adding an acid or a base such as Drano in an attempt to dissolve or dislodge the problem. These chemicals can get into the plumbers eyes  when the sewage is splashed during the repair. The plumbers skin during the repair does come into contact with the sewage water. The owner of the toilet might not report to the plumber they have already tried Drano a highly caustic base .
I just had my pipe under the sink unclogged and new pipes put in $600.00, then they flushed out the pipe from under the sink to the outside pipe $700.00, Total of $1.600.00, I thought that the price was high, I got the plumber from Home Advisors, not sure they had to do all they did but they said I needed the work done. The same evening hike using the dishwasher I had a leak in one of the pipes they put in, they came back the next day to fix it. Don't know if I will use them again.. They were K&D kitchens.
Awesome experience with Charlie's Rooter Service! Our outside area drains were overflowing when it rained and about to flood toward the house. I called Charlie's and they had Luis come over within an hour. Luis was super friendly and ready to help when he arrived. He figured out the problem and snaked the street drain and pulled out a huge clump of roots that were clogging it up! But there was still some backup flooding on the side that he was able to isolate to get rid of the mud and debris that were clogging that up. Before leaving, Luis even gave suggestions on how to flush it out periodically to keep things flowing smoothly. Luis is the best and I would definitely use him for future plumbing problems, highly recommended!