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Basically, "collector's toys" became a thing before high quality toys where a thing. The earliest toys that collectors sought where just ordinary children's toys. Stuff like GI Joe, or star Wars. They collected these because they where attached to a brand they liked, or held nostalgic attachment. Even now you have a lot of toy collectors that focus on toys that have historical precedent, rather than quality.
The big American toy companies are very reluctant to target any products exclusively to adults, and alot of them still operate with the idea that adult collectors will just collect toys by virtue of being the merchandise for a franchise, rather than being high quality. and to an extant, that is true. That's why you have people who wait for Force Friday and buy a ton of retail StarWars toys but don't touch Hot toys or the like. The avenues to sell toys exclusively to collectors, like comic shops and even the internet, are far less lucrative compared to retail.
That's why Mattel will never make Collector's Barbies that are Hot toys quality, for example. They expect their collectors to buy a toy. Slightly higher quality than a regular toy, but still a toy. This is conjecture, but I think a lot of the heads of these companies believe that if people where buying older figures for hundreds of dollars; things like 5POA Star wars figures, they don't see why collector's wouldn't still want the same thing. They probably think most of them will be kept in box anyway, so why bother waisting recourses on better sculpting or more articulation?
Things like that Batman in your OP pic are meant to appeal to children, even if they are meant to be collector's toys. For hasbro and Mattel, a "collector's toy" still has to be playable with kids, and appeal to them, because they're being stocked in the same place as the other kid's toys.
