The thing is, if it's a niche market of a niche market of a niche market (which it is) and thus won't generate much revenue for him because of the tiny size of the market, then letting people develop at will is going to be quite ineffective at exposing people to his publications, as it will reach only a relatively few people via said tiny market.
Anyway, it's his decision, of course, and he's in a better position to decide what's important to him and how he's likely to achieve that than we are.
--matt
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