Time travel fund
The idea: you give $10 to The Time Travel Fund. They put "a percentage" of that money into a trust fund that they're maintaining. (They don't say how big a percentage. I'm guessing about 10%.) Through the miracle of compound interest, that money will turn into billions of dollars in five hundred years. If time travel is ever invented (and legal), the money will be used to pay the people who control the technology to bring the people who contributed to the fund forward in time.
If nothing else, the FAQ is amusing. For example, among the restrictions listed:
You will not be retrieved if you die by suicide. Sorry, but we don't want your family blaming us for you killing yourself because you think you will get to the future sooner.
And there's a section at the end where they talk about how you can use this fund to be reunited in the future with a dead loved one (because people can be retrieved moments before their deaths—there's no mention of potential paradoxes involved). But there are restrictions there as well:
The other person must be a close family member. Sorry, but we don't want you bringing Adolph Hitler or someone else evil like him back.
They don't say what the rule is if a close family member is evil, though.