Stores buying things

I have heard people complaining in chat about going to sell items to stores, and the stores didn't have enough obols for the items they say they are buying. If a store is buying a lot of items, it can be confusing making sure to have enough obols in the store for all the possible purchases. I usually have to use a calculator and add up the total to ensure that I have enough money in the shop.

How difficult would it be, to add a counter that totals up the cost of purchases the store would like to make, and then compare that value to the amount of money in the store? Then if there isn't enough money in the store, make it so the player has to modify their buying list to match available funds?

I am afraid that if players continue finding stores without the funds to actually buy items, that they will stop trying to sell to stores, and I need to be able to buy my stoofs :)