In Australia at least, there's a limit to the sort of shit you can actually do to your house legally, before insurance or other mishap avoidance things leave you in the lurch should something go wrong - even if it isn't your fault.
That, and the fact that people are so afraid of getting their hands dirty, or think that something they don't know how to do is voodoo magic.
Yet the Bunnings car parks are some of the busiest places on Earth. (Bunnings are our monopolistic hardware stores) - and they're not exactly filled with trade vehicles.