First off these are animals; there is nothing wrong with trying to find an economical choice for your budget, but when people start referring to them as cheap it just doesn't sound right nor look good.
Some people just need to adjust their sensitivity level.
The word "Cheap," when used in advertising, is used to reflect the price tag on the animal being offered for sale. Not the value of the animal itself.
When I see an Ad that uses the word "Worthless" to describe the animal being offered for sale, I will jump on this bandwagon.