Yes, I've noticed that.there aren't that many simple thanks on here.
Strange when you think that a dozen or so very experienced professionals are giving advice at their own expense (not free - time is money), saving the posters maybe £100 a go on average.
Like sharon here, what would she have had to pay to get someone out, just to top up the pressure - £50? I don't mind doing it, but a bit more appreciation wouldn't go amiss.