Hi Kevin
I totally agree that there are Agents out there charging a lot for not a lot, these days, just like the sales commissions, are coming to an end.
With regards to the utilities an approximation is easy to work out, however the rental is unfortunately geared to the market price rather than how it should be i.e. work out your costs such as Agent fee's, mortgage, utilities, comm fee's and so on then your mark up and that's your rental price. It's a tenants market as well as a buyer market and therefore the rental price has to be competitive but not necessarily the give away price that some are doing.
You don't have to run your business at a loss to have the Owners best interests at heart, infact I would say that it is essential to have the Owners interests and the condition of the property at heart to be successful. We rented out everything we had during the Summer period and were turning people away after filling some of our competitors/collaborators places too!
This area was the only area that was up on Tourists in the whole of Spain (up 12%), Spain will always be the old favourite amongst the Brits even with the emerging markets and was I believe still no.1 this year for Tourist volumes.
The market is not just the Brits though, this market has been good for a long time and it's now due a slack period!
For the rest of Europe Spain has become very attractive especially with the Scandinavians, French (more and more re-locating long term), the Dutch and Belgians are becoming prominent and are buying down here as well as renting for Holidays and Long term.
With regards to Holiday Rentals, I know I'm biased but a good Agent should be making you more money than you would normally achieve yourself despite commission, unless you invested more capital, had the marketing knowledge (not just placing adverts by the way) and did it as a part time job. They should also be the haven of security and peace of mind, not a necessary evil as some opinion's seem to be or someone you want to avoid like the plague as in your case.
I can understand your negative opinion of Agents, the financials/yield especially with those ridiculously high commission charges, maybe it's time to look for another Agent rather than leave your place fester or simply be a Holiday home.
How is good ol' Sussex by the sea, I see the new stadium is coming on well, I'm Brighton born and bread (well Hove actually, Patcham and Peacehaven)