Sometimes, after spending substantial cash to purchase equipment some photographers try to conserve their remaining expendable photo gear money by augmenting that gear with “inexpensive” (read that “cheap”) gear. More often than not, when that occurs, some purchases turn out to be a waste of money.
In my early years of purchasing photo equipment, before I knew what I was doing, I goofed purchasing camera bags which didn't last or meet my needs, tripods which didn't hold my camera/lens steady, and filters which diminished my image quality.
I've got a list of some of the classic purchase errors photographers sometimes make to save some money. Unfortunately, in the long run, these purchases are too expensive, because they either need quick replacement with better gear, or are permanently relegated to a drawer or closet