The idea behind it was to encourage free trade amongst the several states without undue restrictions, taxes and tariffs...
This is about taxes and screw the small winery (collateral damage). It appears to me, the consumer has no right to purchase for the lowest dollar. That is reserved only for business. The consumer is required to report via use tax all untaxed purchases. Once again it is screw the consumer but business can certainly take the jobs to another state or country because wages are less.
And we call this fair play.