It has nothing to do with the suburbs, it has everything to do with the builder. Everyone in my neighborhood with a pool has a salt water pool. Three different builders actually, but not one of them had an issue with installing a salt water pool. Some builders are just stuck in their ways, and not interested in anything they don't know. They probably still install Easy Touch systems and GloBrites because that is what they know. And rather than talking why they do not, or will not do it honestly, they pull the old "warranty" or "lifespan" card out. You see it a lot with Texas builders for some reason, not as much around here.
I sent you a PM about my builder after a different post you made about PBs, who for sure does them. Did you reach out to them? I have a few more that I know of that work in the area that for sure do salt water as well.
Man, that is a tough one, its not like it was back in the day. My builder in particular is booked up through next year, and everyone I talk to who mentions building a pool has seen the same thing. We do not have a year round building schedule, and not as many good builders as say, Texas or Arizona, so the good ones are booked solid, and firm on pricing. They have people lined up, ready to drop the money, they have very little incentive to come down on pricing, if you do not want to pay it, the next person in line probably does.
You are probably best served by comparing the different builders packages, and see if they will give you some upgrades, or swap out things you want. In our area, the mention that a different builder will do it for cheaper, usually does not prompt a lower cost to get the business.