There’s a reason n=1 samples aren't usually the basis for general descriptions of behavioral trends.
Also think about how tricky itd be to manage a business. Your supply is getting less expensive in $ terms monthly, but also the value of your goods in the market is going down each month. Weird situation.
(There's also an error in assigning unit purchases like washing machines as a proxy for consumer behavior: consumers select within a purchasing category more frequently that then opt out of categories. In other words: deflation and inflation can determine how much you're willing to spend on a washing machine, rather than breaking your commitment to already purchase one.)
Consider yourself extremely fortunate to be able to manage your purchases this way, but also consider that this is not the norm.