I feel like the demand for them has fallen off a little and they have narrowed more to a niche market for those who like the BMW classics. They're too pricey and old now. All the younger kids are jumping onto the E8X and E9X chassis. Even some long time E30 owners I've noticed have decided to sell on and move on to something else.
Probably the difference between those of us who grew up with E30's on the roads and you could pick one up for a dime, play around and learn some mechanical skills because they are a great car to learn on. That's somewhat moved on a little now as they've become expensive and there are more modern options flooding the market with high HP and a modern chassis, with a small element of tinkering to them (Bolt ons, wheels etc).