That is true with items that are related by category, size, price, color, etc. I like hand counting because it keeps the mind aware of what is and is not selling. These systems can be as simple as a tally count. So far, I have not found an computer inventory control program that gives rate of sale or merchandise cycle. I believe in counting inventory on a rotating basis where everything is counted a least once a month or 6 weeks and as new similar items are received the records are corrected.
Merchandise needs to be handled.
Many slow selling items are left in the back room, behind something, in a cabinet because they do not have to be accounted for until one takes an inventory for accounting purposes. Too often goods get sold and not replaced from understock or the tail end of a line gets left where it was, a lonely beauty sitting in oblivion. They are always looking for ways to raise money. Many have auctions or other events where they offer to their members and friends a chance to help the group raise money by buying or bidding for things. Leftovers can be moved out by offering them to such groups.