Well, my site that I am currently adding has the lowest priced service at $10,000: it is B2B.
So I don't get any whim buys, but I have gotten a few solid leads. Now this niche is HIGHLY specialized too, so not a lot of random people searching for the solution: think US government regulation niches down to a tiny, tiny subset of the regulation.
With quora, I have noticed about 3-4 people per day coming to my site, most check out 3 pages per avg, and when I said a few solid leads, I mean 2 out of about 100 people, but at such a high price point, and it is an actual physical serbice, I am grateful for every lead, as to bank hard I only need 1.3 sales per month.
I'll soon be using Quora for another service site in this niche, this one is a digital service, free if they subscribe to my newsletter(opting out of newsletter removes free membership), I imagine this one will be better for Quora, but only time will tell.