"I did X because I wanted to do X" is not a meaningful motive unless X is intrinsically pleasurable.

I disagree. Sure, "I did X because I wanted to do X" is incomplete as an explanation, if you don't also add what makes you want to do X (intrinsic pleasure, a sense of duty/morals, a promise of better financial prospects or better health, etc.) Alicorn's statement is comparable to "by default, one does not exercise (true for most people), and I wanted to be fitter and healthier, so I pre-committed by signing up for a weekly yoga class." Would you agree that it was a meaningful statement if she had said "I wanted to have the benefits of having signed up"?

I didn't say "I did X because I wanted to do X". I said, "I made an expedited decision about how to do X, because I wanted to do X, and X is notoriously easy to neglect for extended periods of time". Imagine me deciding to just eat leftovers for lunch because if I mull over the thousand things I could fix I will still be thinking it over - and really really hungry - by dinnertime.

I didn't sign up for allegiance purposes. I chose a particular service that someone who has reasonably good judgment had already picked, because I didn't want or have much ability to discriminate between the options. Imagine me staying over at someone's house and rooting around in the fridge aimlessly, not knowing much about what's in any of the tupperwares, until someone who knows something about my food preferences invites me to take some of the pasta.

I have savings, and I'm paying my premiums on an annual basis, so I'll have warning and time to seek sources of income before I'm ever in danger of delinquent insurance payments. I have plenty of friends and family who I expect would loan me a few hundred dollars if I asked them to, which means I should never need more than a span of months over which to job-hunt. At the moment I have income that covers that, but I'm not optimizing for income and hope to be able to avoid starting.

By default, one does not sign up at all. I wanted to sign up at all.

"I did X because I wanted to do X" is not a meaningful motive unless X is intrinsically pleasurable.

Misses the point of the statement you quote.

I blatantly substituted Eliezer's judgment for my own and went with the one he picked.

I suppose this means that you signed up mainly for allegiance signaling purposes rather than considerations on the probability of success.

No, that doesn't remotely follow. Alicorn could (and likely did) believe that Eliezer is better equipped to or has simply had more motivation to look into things like probability of success.

"I did X because I wanted to do X" is not a meaningful motive unless X is intrinsically pleasurable.

Unless you mean pleasurable in a broader sense than equal, that's not necessarily the case. People can have other terminal values besides pleasure. (But I agree that being signed up for cryonics is unlikely to be one.)

Sure you do, otherwise, how do you expect to pay the premiums?

I think she means that P(she will able to afford the premiums|she signs up now) is close to 1 and P(she will able to afford the premiums|she signs up in her late forties) isn't, not that the former is literally 1.