Voucher store? No.

I use them to buy research scrolls, then I'll get storage boxes etc.

At this point in time endless for myself as I still haven't purchased all of the available items from the voucher vendors. At some point the only change I anticipate I will start selling but that decision is a long ways off with two fully leveled characters in crafting.

My original goal, which I met summer 2018, was all storage boxes and the Ebony motif. I expanded a bit by putting all the basic craft stations in my house, and learning the plan for the 6M dummy. But now I sell stuff. I'd sell writs themselves, but equipment writs don't sell quickly even at a good price and good location; I think the audience who might buy them is limited and a lot of the time they may not have that particular trait or motif learned.

I've got all the Morrowind plans (sans Dwarven, which aren't in the documents) and Alinor plans. I have only 4 CWC purples left, but stopped buying those documents due to the flood of blue plans I got that I'm still trying to sell (I knew all blue plans prior to the documents being introduced, so they were all dupes).

I'm now saving up for the upcoming Murkmire documents, which will be the same as the CWC ones - 30 vouchers for a blue plan with a chance at a purple.

I've already got all the storage, the motifs, all the gold plans except the target dummies and the new ones (unless I'm dying to have one of the new plans, I just wait until they're 100 vouchers on his assistant). I've bought the basic crafting stations several times over for my various homes.

So, yeah - still grinding vouchers to gamble on the documents, as they'll presumably keep coming out with those after the zone's plans have been out for a while. I do appreciate that the smaller zones have less plans, so a 30 voucher document for both blues and purples makes sense, but it also makes it harder to get the purples.