Best wishes for Seekonk... hope they don't get disillusioned and leave NASCAR again.
"This is something I've always wondered, if there any real benefit in short tracks going NASCAR?"
I'm not sure. Supposedly the track benefits from the NASCAR name and PR machine. But NASCAR has pretty much ignored its short tracks for at least the past ten years.
An example: Caraway Speedway. When I moved to this area in 1988, Caraway was thriving. But the owner wanted a NASCAR sanction, and finally got one after NASCAR changed its "protected area" policy (before, Bowman-Gray Stadium in WInston-Salem was too close to Caraway). After getting his NASCAR sanction, Caraway's owner spent a lot of money improving the facility: paved most of the pits, fixed up the track, built some additional grandstands and concession stands, paved more of the areas that fans used, fixed his septic problems, and created a larger more formal fan entrance. The track is pretty nice. But his car count has dropped to about one quarter of what it was, and his grandstands are almost empty. I knew several racers who quit going to Caraway after it became NASCAR sanctioned because their cars became obsolete (didn't fit NASCAR short track class rules) and because now they had to pony up for an expensive NASCAR license. This all happened at Caraway sometime in the mid-1990s, and Caraway hasn't recovered since.