Confront them with this number, juxtaposed with the fact that there are ~8.7 million active believers in the world[1] already, and ask WTF the use for you of joining is supposed to be. Queuing up as #8,700,001 for 144,000 spots?!?
1: According to https://en.wikipedia.org/wiki/Jehovah%27s_Witnesses#Demographics
1: According to https://en.wikipedia.org/wiki/Jehovah%27s_Witnesses#Demographics