Bob,
You are a veritable mine of information!
I have registered for liftshare and will give it a go if appropriate. However, having given this a few minutes thought though, it would appear that you would be reliant on getting a lift with a person you dont know and would never have met previously. Couldn't say I would risk missing a match on that basis if they didn't turn up. Obviously there would be less of an incentive to post that you were offering a lift as you would be sorted yourself anyway. The extra petrol cash, I would guess, is not a big factor for most fans.