Usually people already live there and have normal jobs. Some big attraction is commercialised, a company (often but not always from outside the community) profits off of it. People like it so more and more keep coming, causing prices to jump. Slowly but surely people can't afford housing. Normal businesses that do normal work can't remain competitive when their offices get much more expensive, so they depart too, leaving only more tourism-focused companies to be profitable. The locals have to choose between leaving their home or joining the companies that ruined it.

Mass tourism industries do provide a lot of income for businesses that profit off it. But to do so those businesses have cannibalised the actual life and economic activity of the location. Nice for the businesses, less so for the people who just wanted to live and have a normal job in their home town...