Take a second and ask yourself why a company that wants to make as much money as possible would limit the production and availability of a non-legacy product that would supposedly net them a whole bunch of money.
Once you realize it makes absolutely no financial sense to limit a product that would supposedly make a whole bunch of money, you should then explore three possibilities:
1) The limitation in production and availability is done because the signature shoe (in this case, Kanye West shoes) belongs to a non-athlete and thus promoting and creating visibility for the shoe is done without the support of major sports leagues with a global reach of millions and billions of viewers, meaning that promoting the shoes is a nightmare that involves further deals with non-athletes, leading to a complicated mess of contracts and meetings with people with next to no idea on how the footwear market works.
2) The limitation in production and availability is done because the majority of the hype for the product is artificial and based on actual internal data from forecasting and demand planning, the signature shoe is only desired in a handful of markets and a small as a pinky demographic that would not -- even with the most creativest of accounting and number fudging-- lead to a noticeable return in the investment.
3) The limitation in production and availability is done because an extensive association between your brand and a high risk self-admitted clinically depressed individual who supports a man who has admitted to drugging women is not a smart idea.
Sometimes you have to take a step back and look at this stuff from a different perspective. Just take a minute or two and think about the following. If you're a really popular music artist and you struggle to sell 1 million copies of your $9.99 product in a market with over 320 million people, what does that tell you about your audience? Will your audience -- the very same one that would know when you're selling shoes -- come out in droves to purchase a $199.99+ product from you that has absolutely nothing to do with music and has no performance and or athletic value?
The truth is that you can't sell something without buyers. Shoes, jackets, videogames, eye lashes, pencils, dog leashes etc. Whatever it may be that you make, if you don't actually have an audience of people who will give you money for your product, then your product will not survive. The question then becomes: how do you make a product (with a small to non-existent audience) survive? It's not terribly complicated. A low volume - high margin strategy will give a low demand product life. If you sell a low amount of your product you still win because the margins are in your favor.
Kanye West is really popular artist, but his popularity does not translate to an ability to sell millions of products in an entirely different industry that will bring in tens and hundreds of millions of dollars. That's the actual reality. Once you can understand and accept this, you can then understand and accept how business is done with a lot of celebrities.