In reply to Tris:
Because people don't seem to want to stray too far from the path and they don't mind doing poor routes. Oh, and lets not forget that there ain't that much bolted Fr4,5 rock in N.Wales. If they went up the levels a bit to the Sidings for example, which incidently is out of sight, has better and cleaner rock, and routes in the Fr4,5 range, maybe there wouldn't be such a problem. As for taking groups to a crag where half of it is capped by several feet of tottering slate choss, thats another matter.
Ooh and while I am ranting, it's interesting to quote the existing slate guide for this section Dali's hole:"A number of routes have been done on the friable slab to the right. However,even by slate standards, these are disgusting and as such are best left unrecorded." It's amazing what a crow bar, spade, wire brush,13mm bolts, and a lack of quality control can do to a crag.(no offence to Colin Goodey who put up a few routes;the relatively better lines,and left it at that)