>If people find their app, like what they see, and are willing to pay the price, what is your objection exactly?
My more general objection to your question is that I don't consider individual preference, or individual choice, or individual action beyond criticism, just because the individual is "fine with it".
People can "find a product, like what they see, and be willing to pay the price", and the purchase could still be stupid and deserved to be called as such, and the price could still be highway robbery and be deserved to be called as such, and the product could still be subpar/average/bad and be deserved to be called as such.
Do you think you know better than the companies developing these products and the consumers buying them? Do you believe you understand what the right products and fair prices should be? This seems to justify your use of terms like 'highway robbery' and calling people 'stupid'.
I would have words for such viewpoints, but for the sake of a civilized conversation, I won't express them here.
Why don't you let the actual target audience decide whether the niche is served or not? Everyone has a different definition of "minimalist" and niche markets may have more specific requirements, so if someone can sell their specialized tool then what's the problem with that? Nothing of what you wrote is a reason against the existence of more choices.
