I've had mixed success at best,
a stock request where one person offered one at a very reasonable price, another replied asking an utterly ridiculous price,
I've picked up a couple of barrels that were at realistic prices, so not cheap, but cheaper than they would have been on the auction site.
Of the wanted ads I've replied to I reckon I've only had about 1 response in 5 offers
Most annoying (on another site) was a wanted add that I'd had a reply to, but when I contacted them was told a 3rd party had jumped in & they'd sold to them
I did also get offered a sub 12 pcp in .25, completely out of the blue because the owner knew I liked them.