You make excellent points, indeed speculators outweigh collectors. That is true of most markets. Even if one is to start a collection of passion, the sums involved deter one to divert too much from Patek or Rolex for fear of steep depreciation. No one wants to build a collection only to find out they've lost half their original capital.
ALS "comps" are indeed thin and there is little marketing hype driving the brand.
The Richemont Group owns some of the best brands in horology. ALS, VC, JLC etc are all phenomenal brands that if managed like PP would attract a wider array of customers. The quality of their products is no less than PP, at times it is better and one can certainly argue that with ALS.
I sense this trend is not going to change anytime soon, unless Richemont invests in supporting the value of its products as PP has. Alternatively market share can be lost by PP if it stays static, which in fairness they have not ever since TS took over.