Why not also expand it into a 'Work needed to do' and 'Services offered' type thing.
Somebody who needs their kitchen rebuilt could perhaps find a carpenter to do it - thus money goes from one traveller to another etc. Obviously no endorsement from HU as to the suitability of anyone replying to anything.
But a bit like ebay, people could build up a good reputation from feedback left.
So I could post offering Mac support for example, a carpenter could post offering his services, somebody wanting a load of scrub cleared of their land in Cornwall could post some pictures and ask for quotes etc etc
Just a thought anyway as it's hard to find somebody with a good reputation and a good work ethic etc