I think most of the jokehovian numbers are also bogus. Unlike the mor[m]ons, they do not have systemic doctoring of the numbers.
Yeah it's a good point, because the reality is that JWs are determined to be viewed as the best, unique, approved, yadda yadda. They completely massage the numbers. Also because they are smaller, any small uptick translates into a bigger percentage.
I think most other religions are not as obsessed with that.