I'm pretty cheap, but............
Cheap grated parmesan cheese is just gross.
Cheap wine is usually not very good, unless it's the second bottle then it doesn't matter.
Cheap rebuilt auto parts can cause problems on installation and they sometimes fail prematurely.
Cheap, off-brand tires don't last.
Cheap toilet paper is too rough, and cheap paper towels don't soak up or hold up well.
Cheap haircuts make me look funny (but I still get 'em).
Cheap contractors, auto mechanics, plumbers, etc. sometimes don't know what they are doing.
Cheap pool floats pop after the first use.
Cheap surfboard leashes sometimes fail.
Cheap electronics don't usually last very long.
Cheap plastic surgery is usually not a good idea.
Cheap women can sometimes make you itch.