The store is fine as it is, take that from someone who spent almost or over 500$ on the store.
The founding father set should just be deleted in my opinion, it's the only 'pay2win' pack in the store and is a bit overpriced (even though i don't mind it that expensive since i consider it the only 'pay2win' item, it's too fast ingame-progress to be bought!)
Silver is also slightly overpriced in my opinion, but there's enough ways to earn silver ingame that deleting or making it cheaper wouldn't change much.
Making it cheaper would increase the sales though.
I would love to see mask-mystery-boxes, and even clothing-mystery-boxes, and what about a tool-mystery-box? It would contain all kind of tools, with a superlow % of finding a halberd, a rapier, or any type of special looking item. (I know some people who would buy boxes untill they had a halberd!! including myself)
I didn't like the previous player owned stalls in Salem, there were too expensive, there were too few, or the bigger groups bought them all up.
I don't like the idea of an auction house though, it creates less interaction with other players.
However, I would love to see player-owned stall in the form of a player being the vendor/stall.
You could add a shopitem or a new end-game skill called a 'selling license' which would allow the player to afk-sell/buy 4 to 6 items
(shopitem being time-limited to prevent altspamming, or a very-very-end-game skill)
kinda like in Ragnarok Online
Thats some thoughts I had on the fly =)