Ted - you seem to help shift quite a few cars these days. Isnt it about time you got some revenue from this. Even if it was only asking those that sold their cars via you to contribute £10 or so ?? Dont think that this would go down badly , just relies on honesty. G.
It's not a problem really. If people felt like they wanted to show their gratitude, they could (one 1 has in three years!). It's a useful part of the site for attracting readers and advertisers, so it does have great worth to me indirectly.