Most people who scream that they want paid themes are not getting the idea that something trendy or "Hot" does not extrapulate out to guaranteed sales and totally relies on research that may not lead to hypothosis that do not pan out.
If it is the case why isnt their a tik tok pinball table? Paid themes date a machine where as un paid themes dont.
Can unpaid themes have a place, sure but it depends on wether or not the hobby will drop the attitude of only demanding paid themes and be acepting of orginal ideas.
"Unpaid themes dont sell well" is really an indictment on the hobby trying to justify spending large sums of cash on an "toy" that costs alot of money to their significant other.