In reply to Anonymous:
> .. why would anyone be top roping a perfectly good crag with sound rock suitable for placing leader protection?
Because they want to climb the route, and, for any number of reasons, don't want to lead it?
> I haven't been on grit for many years now. The only area where top roping historically appears to be acceptable is on SS due to the dubious nature of the rock and the risk that leader gear could damage it. So has this practice now spread to grit and other areas, and how prevalent is it?
It is the accepted practice on Southern Sandstone since, as you know, the only other viable alternative is soloing. I don't think there's been any particular 'outbreak' of it here on grit - it has always been used both for beginners, and for practice. Of course, at the harder end it is regularly used - there, it is disguised by the phrase 'head-pointing'.
So I don't think there is a problem with the practice per se: the problem is groups or individuals who hog routes and/or areas of the crag in this way. That's to say: the problem is one of bad ettiquette.