One thing I learned about yoyo’s, in general, is to not think about the past.
If something is out of stock, just assume it will never be restocked. Because, in most cases, it never will. They may restock the model, or update it, but chances are they won’t do a second run of the colorway you were eyeing.
So it’s better to live in the moment and look to the future with purchases. If you want something limited that is available now, grab it. Open a credit card. Whatever. It’s unlikely you will get a second shot.
Naturally, there’s exceptions, companies like Yoyofactory produce large numbers and restock frequently on their popular models. For smaller companies, however, more often than not your only chance of getting something specific that is sold out is the BST. Even then it could take months, even years to find that specific throw.
Also keep in mind, just because a company is popular now, that doesn’t mean they will be in a year. There’s staples that aren’t going anywhere (One Drop and CLYW, for example), but there’s been so many other companies that just completely fell off the map and completely halted production - Companies people loved - It’s pretty clear that the industry has a lot of coming and going brands that just can’t sustain. I can think of at least three off the top of my head that I doubt will be around in a year, and I’m sure there’s more, sadly…