Well, last night, I went ahead and quietly opened the Yorick online store after having tested it a few times with different browsers and machines.
Unfortunately, near as I can tell, the only person who noticed and tried to purchase was unable to get through the payment screen from PayPal. (I've sent queries to both PayPal and PayLoadz, the digital download service I'm using for help. PayLoadz responded very quickly, but unhelpfully only said that it's a PayPal problem. PayPal, on the other hand, remains silent eight hours later.)
Now, what I don't know is whether he's the only person who has tried to buy Yorick, or whether lots of people are failing to purchase it, and only one person is letting me know that it's broken. I hope it's the former.
So, if you're planning on puchasing Yorick, and you feel like helping me out by being an e-commerce guinea pig, please consider trying your purchase now, and if you get blocked, posting here with details on where the process fails.