Below states my opinion on why *NOT* chest shop.
We have sign shop.
The only real limitation of a sign shop is items with long names.
-That's why we have /auction. <-Would be nice if the price is not capped at 10k/ea, with 5 item listings, and not so friendly items alignment.
The essentials are kind of broken now, so there would be issues where items not registering.
Once it is fixed, if ever, I would say chest shop is at lil bit of disadvantage, especially considering how compact the sign shop is, and the ability to store items up to an unimaginable volume.