I feel your pain. Our guild attends the Sewing Expo in Cleveland and the major show in Columbus, OH and I've skipped both this year. You are correct in that it's the same items for sale, with the same display quilts, in the same booths in the same location. No wonder the shows have lost their luster for those who attend regularly.
With computerized long arms the show quilts are too perfect and over quilted, so there is a sameness. Very few quilts are original patterns and it's possible to find 5 Judy Niemeyer quilts in the same pattern on display, lovely, but the same.
Sometimes a good shop hop to out of the way QS can rejuvenate interest.