Tax rates seem to be a want bonus compared to their actual needs anyway. If it was really as big a factor as pundits claim we would see a lot of jobs in unincorporated areas - yet instead they are in places where populations and infastructure are. Essentially it is a reverse of why there is a sticky price point of items disconnected from actual price - it is what the market will bare.

If the fundamentals of an area are good the appropriate response to people demanding concessions leaving is "don't let the door hit you on the way out".