Its not cheating people its just bad business to remanufacturer new SKU every year or so.
The cost of setting up a new manufacturing line is costly, so your profit margins are low, and you lose bulk order distributor with each product revision, cause distributor lose money on your old stock.
What you ideally want in this type of a business is one SKU with one manufacturer, and one chain of loyal distributors who keep coming back for more orders year after year.
Each year your COGs (Cost of Goods Sold) should decrease due to the lower cost of manufacturing and your profit margin should increase.
Its business 101.