Who buys Sentinel?

So I was looking for something to dump Guild Commendations on, and Gw2efficiency said Sentinel Insignias have a highest profit. So I did that and then thought "wait, does anyone actually buy these things-- did I just waste my commendations?" and there is a big difference between buy/sell prices and not that many people wanting to order. They did sell eventually, but I only sold 5. That leaves me wondering who actually would buy them. Is there really any content in the game that demands you maximize vitality?

I also guess the point of this story is sometimes one should think twice and not just follow what a site tells you do since there's no guarantee things will sell at that buy price. I then went after guild arrow carts-- now those sell fast!

Well... I did try to build max vitality on my necromancer to try some (obviously off-meta) WvW roaming just to maximize the life-force pool as well.The build I was using got nerfed since then (several traits reworked), and I decided it would be easier to get a legendary armor set than waste guild commendations anyway.

Sentinel simply don't matter when soldier stats exist. The only use sentinel would have is on a build made to troll people in wvw.