OK, my (second hand it must be said) experience of this is from the town my mum grew up in, Aberaeron in Dyfed.
Down at heel fishing port, bit of tourism, market for local farmers. That was until about 20 years ago when in a generally very good scheme to move some Welsh government out of the M4 corridor, a good chunk of the Welsh civil service was relocated there. In that case you did get locals priced out and forced onto concrete and piss council estates. Similar in Monmouth (but not the civil service this time), due to it being a commuter town for Cardiff/Newport, and retirement home for ageing Express readers.
Lancaster saw similar when the university opened, although it can be argued that the economic shot in the arm there is what's holding the place up. Quite often the new blood is what the area needs, but people resent it if they can't afford or feel excluded from it.
Anyway, sorry for earlier. You're not a cunt.
"There ain't nothing you fear more than a bad headline, is there? You'd rather live in shit than let the world see you work a shovel."