There was a discussion here a while back that suggested a realistic value for an overnight is £300.
Never having tried an overnight I thought I would try an RB for an overnight outcall and see what would happen. So I put the suggested price at £290 for 12 hours 8-8. The comments indicated that I would expect to sleep for part of that time, the WG would be fed and watered, and that I was looking for someone who could hold a knife and fork as well as a conversation. Services were minimal, though I did say that DFK was a must.
I got 33 bids in total which, eliminating nutters and skanks I wouldn't touch with a bargepole, break down as follows:
@£290 - 16 bids
@£330-350 - 2 bids
@£390-400 - 3 bids
@£500+ - 8 bids
Nationality: With only one exception all the bids £290-350 were British. Most of the £500+ bids were foreign. A "won't get into bed for less than" mentality at work.
Value: All of the bids in the £290-350 range had a 'normal' price in the range £600-900. So clearly there is great value to be obtained by doing an RB.
Suitability: Some clearly hadn't read my comments. If I say DFK is a must and it's not on your enjoys list then why bid? Or at least say something about that.
Hours: Two of the bids thought it a good idea to have an even longer time, arriving with me before 5.00 pm.
In the end it came down to a choice of 4 in the range £290-350, and I chose who I thought was the best, rather than the cheapest.