Personally I don't see how removing "free" chapters will help turn a profit, I'm only going by personal experiece but I find myself buying chapters when the novels interesting but using the free chapters to "push through" till next interesting section, now that the novels aren't getting free chapters I don't see myself paying stones on the filler chapters so the novels may as well be dropped and not get the stones I would've used on future arcs if they get too drawn out.
By the way I'm not a user who only uses free spirit stones, I buy spirit stones atleast monthly if not more often, so I'm not opposed to throwing away money, it's just that chinese novels have a tendency to try and "draw out" the content since they get paid per character I hear, and if I have an option to throw my stones at a novel that is interesting at that time or not interesting, I'm going to give them to the interesting novel.