I think it's about time the classified had an over-haul. I know it wasn't that long ago that the wanted/for sale/sold tags were brought in, and that's helped (when people have stuck to the system) but the general arrangement is still lacking some organisation. The only layout issues are that there should be a dedicated wheels section - genuine or reps, sorted by size (diameter) etc.
Other than that, I think we/you need to start being more strict with the listing guidelines. I'm not saying people are posting things falsely or anything, but there is a clear lack of understanding of where an item should go. Audi Cars should only have wanted/for sale ads for Audi cars. Not OEM parts, not non-OEM parts, and certainly not non-car related things. It's not a difficult system to follow, but people are either being lazy, trying to maximise views or just not able to access the drop down menus bit (possibly an issue with tapatalk users?) that sort where your ad will end up.
Right now, on the Audi Cars page, there are 13/30 ads that shouldn't be there - a private reg, tyres, lights etc - and I reckon it's time to get warnings going, or just cut out all wrongly listed ads (either delete or move them). They should be 1. Audi Cars, 2. Parts for Audi cars (oem or aftermarket), 3. Non-Audi cars and parts, and 4. Non car-related things (TVs, phones etc) to match the titles.
It's not just and OCD thing, it makes it harder for everyone when things aren't in the right places. You either don't see what you've been searching for because you didn't check the Audi Cars page for the wheels you were after, or you take 3 times as long to browse through the ads to find the car you want because you have to skip past ads for dog guards and plasma TVs.