I don't think people charging "too high" is really damaging the industry (though I am certainly not one of them).
Whenever I think that these prices are extortionate, I remember a job I was on a few months ago for a brother & sister who's father had just been put into a care home. The house was empty, and the locks needed changing. The locksmith came while I was there. I cleaned 3 rooms, charged £80 took me about 2 hours in total. The locksmith (I think it was a franchise company) was there no more than 15 minutes - "£127 + VAT please".
Call a plumber, electrician, carpenter out for any jobs, you'll be lucky to get any change out of a £100 - not to mention the fact that they get a markup on materials they supply.
If you perceive this to be a "unskilled" trade, then that's all you'll ever charge for.
It's not ideal, but I'm looking to increase my prices steadily over the next 12 months once I have established something of a reputation in the local area.
Also, I don't care what anyone says - if you're charging more then you are more able to provide a better service. For example - putting the rotary around after every suitable job to help drying/lessen wick back, perhaps spending more time on stubborn marks etc.
If you already have the time to do these things without worrying, then perhaps you are already charging enough FOR YOUR NEEDS.
That said, we're all self employed for a reason.