[quote name='icastle' timestamp='1456509215' post='2989878']
With the best will in the world, this is just never going to work because it requires people to get things right when they post their ad or sell an item.
On a daily basis we still end up moving numerous adverts to the correct forums and if people can't get that basic step right then any further layers of granularity are just going to result in dozens of extra subforums full of stuff that doesn't belong there.
Whilst I can see the logic in what is being proposed, the reality is that forum (which is what we are of course!) software simply isn't geared up to do heavy duty e-commerce stuff.
[/quote]
Quite right. Commercial selling websites have honking great databases in the background, that users can search on multiple parameters (whether or not they realise it!)