Jehovah’s seem to be trying to get my 85 year old father into their cult

[Tonus]

It's incredibly unlikely that the JW's who talk to your father are after his money (if he has any to begin with).  It's the Watchtower Society -itself- that runs the racket, not the individual halls or members.  Everybody gets fleeced equally on that count.  They might, of course, suggest that an elderly person write said society into their will.....lol.  Donations are greatly encouraged, and all of that money goes up, up and up.  The way it's used would make you giggle at the simplicity of the con, but there's nothing illegal about it, so meh.

Yep. The JWs pride themselves on not requiring donations at their meetings (they don't pass a hat or tray, and their donation boxes are not conspicuous), but they are pointed at Bible examples that are meant to imply that a good Christian gives until the well is dry. Individual congregations are encouraged to be self-sufficient in addition to providing donations to the mother ship, and thus there is some "local pride" type pressure to give (which means that there is a lot more coming in to HQ than going out). The members themselves don't see potential new recruits as marks to be exploited, because they don't consider themselves to be such. The best con has as few people on the inside as possible; better for the rubes to work for you than with you.

The descriptions of heaven in the book of Revelation as a place brimming with gold and jewels gets taken pretty literally by Christian leadership, it seems.