I have listed I am on holiday clearly until my tour starts in September on adultwork. Also in my booking availability section, plus my email signature ; yet I still keep getting emails asking if im free tonight 
what do service seekers actually read I wonder ?

I get this a lot too. I don't think many bother to read past the rates and enjoys to be honest, although some of them don't even bother to check those sometimes.

I've found that having a separate tab at the very start of my profile stating i'm away tends to lessen the annoying inquiries as it's the first thing they see when they click on my profile. I write it in bold and have the tab as the first one so it's positioned directly above my contact number so when they go to take down my number directly above it in big bold lettering it says "I'M NOT WORKING UNTIL SO AND SO" or such like  x

I think they just look at the pictures then call . The number of calls I've had that have gone like:

Him: (at 3pm on a Saturday) can I come and visit you later?

Me: I'm afraid I don't offer incalls or work after 4pm on Saturdays. I get the impression you've not seen my website?

Him: I'm on it now

Me: (thinking oh FFS ) Oh OK. Well, shall I leave you to have a good read through it, then if you're still interested in what I offer and when it would be lovely to hear back from you?

Honestly, you can put things in bold red type on your site and they still miss it! I'm afraid my philosophy (unless I'm in a really good mood) is if they can't be bothered to spend a few minutes reading the basic info on my website I can't be bothered to waste my time going through it all on the phone or email. Invariably I've found the best clients are those who can be bothered to read.

hardly any of them read my add i am a bdsm sub and as soon as i say im a sub not an escourt they go ooh and i also dont do incalls and i have to say that nearly every time even though it states clearly on my ads i only do outcalls

I'm the same! On holiday from uni since early/mid June as I am at home for the Summer. Have it listed in bold caps at the top and bottom of my profile, no way they can miss it, took my number down whilst I'm away, also mentioned in the text of the profile and I have an autoreply on, as well as my availability blanked out for holiday. Not working til September, but constant requests keep coming through asking if I'm free tonight >_< ugh.

 "How much do you charge" - so they scanned all the way to the bottom to get my number but didn't read my rates... fucking twats!!! rrraaahhh!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

All the time!!! I tell them to go back and read my ads/website.