It's not a depression if "depression-themed" merchandise is salable.
First, it's not a depression if people actually have money to buy cutsie depression-themed junk, as opposed to, say, food, clothing, and shelter.
Second, it's not a depression if people are able to see anything remotely humorous about the state of the economy or the possibility of a depression.
I'll be kind and assume that those who see economic depression as a market opportunity simply don't know what they are talking about. And so I'll suggest that such people browse the Dorothea Lange archives rather than speculating on the sort of personality that might see bread lines and massive population displacement as a good thing.