Disregarding the legal aspect, personally I think that anybody doing less than 30 hours in a year is (a) probably dangerous, and (b) should be questioning whether they should really be doing this - or at-least, doing it the way they are.
Bollox. Surely 100 hours a year would be safer still. If they meet the requirements and pass the LPC /club check outs/ revalidation flights etc then let 'em fly. GA is being regulated out of existence as it is never mind sanctimonious pontification from those who can afford to fly more than others.