Thailand has made it clear that it only wants 'quality' tourists, not sweaty dreadlocked backpackers on a gap year.
Add to that the draconian rules on alcohol, fines for smoking on the beach, nightlife shut, parties raided, ever changing entry requirements, the gentrification of places like Koh Sarn Road, it's really no wonder that students and young people generally are avoiding the place.
If I didn't have ties to the place (gf, condo, vehicles, job etc.) there would be dozens of places I'd visit before I considered coming here.