Panchoud

The purpose of ranks costing more through rank upgrades exists to create incentive to purchase them directly rather than going through upgrades, it also allows for a more gradual increase through ranks over any period of time since ranks are permanent - this is a simply a sales factor and will not be adjusted, if you do not want to spend that much money on a rank upgrade because you feel it is not worth it then it is solely up to you.
Otherwise, the points that @TickleMyPickle pretty much sum up the rest of it.

This is probably a good idea, items that are listed for over a specific period (such as 3 days) should automatically be removed.

No I mean let's say I sell a stack of 64 cobblestone for 1 Billion. Obviously no one will purchase that listing. 
So by default, all items on the store should have a 30 expiry timer. If the item is not sold within 30 days, it will be returned to the player in a "/collect" item panel.
This idea is meant to remove inactive listings which are sitting there longer than 30 days. For example /shop has a person seller 2 shulker shells for 10,000,000. It's been there for months. This idea will remove such items from the shop and return them to the player who listed it originally for relisting should they chose. 
 
This idea is not for an "Auction House". It's meant to improve "/shop" and make it less cluttered. 

I KNOW I HATE TO keep searching for the item in the shop cuz there is so much junk in it

The one who put the 2 shulker shells for 10,000,000 is Donate, right?

SERVER SUGGESTION
What platform is this suggestion for?: Survival Server
Description

My idea:
 
Set an expiry timer to items sold in the shop perhaps for 30 days? It will help remove clutter and also items that are overpriced and not being purchased!
 
Thanks

If you are auctioning then there is a bidding system. Do the item goes to the highest bidder after "x" amount of days.
Not suggesting for that at all.
I am suggesting a system for removing items no one is buying from the shop after 30 days. No bids. Just a simple listing expiration.

If you are auctioning then there is a bidding system. Do the item goes to the highest bidder after "x" amount of days.
Not suggesting for that at all.
I am suggesting a system for removing items no one is buying from the shop after 30 days. No bids. Just a simple listing expiration.

If you are auctioning then there is a bidding system. Do the item goes to the highest bidder after "x" amount of days.
Not suggesting for that at all.
I am suggesting a system for removing items no one is buying from the shop after 30 days. No bids. Just a simple listing expiration.

My mans, screw the shop. This seems like an auction house change to me.

No I mean let's say I sell a stack of 64 cobblestone for 1 Billion. Obviously no one will purchase that listing. 
So by default, all items on the store should have a 30 expiry timer. If the item is not sold within 30 days, it will be returned to the player in a "/collect" item panel.
This idea is meant to remove inactive listings which are sitting there longer than 30 days. For example /shop has a person seller 2 shulker shells for 10,000,000. It's been there for months. This idea will remove such items from the shop and return them to the player who listed it originally for relisting should they chose. 
 
This idea is not for an "Auction House". It's meant to improve "/shop" and make it less cluttered. 

SERVER SUGGESTION
What platform is this suggestion for?: Survival Server
Description

My idea:
 
Set an expiry timer to items sold in the shop perhaps for 30 days? It will help remove clutter and also items that are overpriced and not being purchased!
 
Thanks