They pay it with their life insurances. Doesn't make their descendants very happy, though, as seen in this topic.
So if you wish to preserve yourself from relatives who may value money more highly than your life, then set up alternate life insurance to give them money, such that they may be less tempted to interfere with your suspension in the hopes of getting that money.
Also, the insurance policy that you use to fund cryonics, make it explicit that the entire sum assured should go to the cryonics provider, no matter what happens (ie, even if you should be blown to bits in an aeroplane crash, they get the money). Otherwise, if you make choices on the "Non-Suspension Rider" such that if you're not suspended the money goes to your relatives instead of the cryonics organisation, you are suddenly incentivising your relatives interfering with your suspension.
You may not think that your relatives will value money more highly than your life, but it is clear from past experience that one of the biggest hurdles cryonics faces is not technology, but greedy relatives.
I am quite assured that my next of kin will not try these tactics, as she is also a cryonicist, but I take the above steps regardless, and counsel all others (including her!) to do likewise, as it is the most rational option.
It just makes good sense.