The main reason is of course that building work is the last refuge. With nothing, without even existing, you can still build, and build to great skill. It is just that the appearance of a bunch of hairy Lithuanians bent of societal revenge to do your kitchen may alarm us steady folks with mortgages to look after. Nomatter how much you admire Keef, you don't necessarily want him renovating your home.
Building is the last authentic work and get pissed culture(as Scott so often reminds me) and woe betide anybody who confuses that with people knocking up faux eighteenth century kitchen sideboards in the Cotswold's while wearing period costume, they are doing something else entirely. The mucky end of building is the mucky end, which is why our neighbour has already scarpered at the very thought of the hun appearing over the hill, even before they phoned to say 'later boy....later' .