@Sweet_Serenity I'm not sure it is because some items are no longer popular; could be.
It must be hard for anyone to figure out how much of any product you need to manufacture and make sure sells out. The person(s) at QVC making the decision must be very savvy with what their buyers want to ensure they don't get stuck with a lot of product after the TSV.
The thing that makes it even harder is that I have heard some vendors say on QVC that they had been "working on this TSV since last year," which indicates to me that they have to not only pick out which item will be a TSV, but way ahead of time determine how many they think they will sell.
Based upon the things I think will be a good seller, QVC would probably go out of business if I was the one determining what will sell or not! LOL!!!