I agree with most comments here, I don't judge people by their occupation and agree with Foser, that not all builder will attempt to steal your car, TV and wife. Although the last time a builder was at my house, my tea bag collection appeared depleated! (only joking!)
I also agree with Tony that this will probably never happen, as I have stated the chances of a clubhouse, Paramount or any facilities in the next 5 years are slim, in my view.
However if the builders do move in, I imagine that they WILL use the facilities. Remeber we only have 2 facilities on our urbanisation, A supermarket and a Bar.
These people have to eat, so they will probably use the supermarket and if I was suck on an urbanisation and sharing a place away from home with a group of guys. I would probably spend many nights in the bar, to ease the boredom. So I think that an influx of tradesmen would significantly boost trade in Al Katraz.