I also see it quite regularly - the alloy decks make it more noticeable much quicker.
A relative has a 1999 Masport, I noticed it was progressively being eroded at the aforementioned spot - straight after he installed rendered brick edging.
I warned him that I can fix the engine, but if the alloy deck cracks and thins, its had it.
Thankfully, he payed attention. Doing a modification (and adjusting the mixture) on his Homelite line trimmer's carburettor to make it start second pull instead of tenth also helped I think
