I think 'it depends' Sally. If somebody has found something unusual for sale that would definitely be of interest to others then fair enough. If it's just a random link then there's little benefit.
What I would say though WBF is with a title like "rams for sale", you're going to get loads of views but probably little interest - it's not focused enough. Better to make it "Lleyn rams for sale in Ceredigion", include the price in your ad, and of course photos. Sure, you'll get fewer views but IME you're far more likely to get a sale that way, partly because google will then pick up the thread and make it available to non-TAS members.
OK, enough discussion on a sales thread. Apologies for the hijak WBF, and good luck with the sale
.