I like to say, you should only buy from a dealer if you are willing to depend on them as your only service source. If you buy from a distant dealer, and a local one comes through, that's great. But figure that they won't, when buying...
These guys usually aren't getting rich doing this. They may make money on service and parts, but not as much as you might think. The warranty work pays almostt nothing, especially when you consider the investment in equipment and trained staff. And we all like to buy equipment that doesnt have warranty issues, anyway! (trust me, warranty used to be the gravy that kept car dealerships open, those days are long gone!)
As to actual service, yes they are required to provide warranty service to you if you buy elsewhere.
You probbably won't be top priority
They won't tend to cut you as much slack on grey areas.
They won't honor saleman's promises (sure that batwing won't tear up yer TC24..!)
Better not call him at at 2am on sunday needing a part...
The manufacturer might not be as inclined to help, either, since they are set up for local servicing dealers. (been there, done that in the car business...)
I actually bought my current machine out of state, but the dealer is just as close as the "local" in state guy...