Title text: I lead a small but extraordinarily persuasive religion whose only members are door-to-door proselytizers from other faiths.
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Using percentage of growth can be a misleading value to use for gauging the importance or popularity of something. If you have 5 members and then add 10 more that would mean you have achieved a growth of 150%. However in the case portrayed in this comic the claim appears to be somewhat substantiated as the door-to-door proselytizer claims to have 38,000 members (meaning they would have grew from 20,540 the previous year by adding 17,450 new members).
Black Hat attempts humorously to show the flaw in using a percentage of growth statistic by growing his group by 100% by increasing his membership from 1 to 2.
It would appear the joke in the title-text is that Black Hat was able to get another door-to-door proselytizer not shown to join his new religion.
[A man sporting a thinning comb-over is holding a black book and a clipboard]
Person 1: You should check us out. We're the fastest-growing religion in the country.
Black Hat: "Fastest-growing" is such a dubious claim.
Person 1: It's true! We grew by 85% over the past year.
[Black Hat turns to off screen right]
Black Hat: Hey, Rob — Wanna join my religion?
(from off): Sure, whatever.
[Turning back, Black Hat pulls out a steno notebook and pencil]
Black Hat: Well, looks like my religion grew by 100% this year.
Person 1: We have 38,000 members!
Black hat: Hope, they're all OK with second place.add a comment!