I'm saying that the burden of proof should stay on Alcor because they are the ones trying to make money.

Epistemological conclusions shouldn't be based on fear of being scammed. Alcor's motivation should be taken into account Bayesianically, but argument screens off motivation (limited of course by dependence on unchecked facts).

they are trying to charge you for services which they claim "will work".

From the Alcor FAQ: "Is cryonics guaranteed to work? No."