1: If cryonics is appealing because it potentially saving your life, then not signing up once you have the money is effectively suicide / voluntary euthanasia. The fact that other people could be saved by your organs is true whether or not you are signed up for cryonics -- so if your life is worth less to you than 4 or 8 strangers' lives, you should commit suicide and donate your organs.
If you don't want to commit suicide to donate organs, you shouldn't want to avoid cryonics to donate organs.
2: This is not a reason not to do it, it's a reason you literally currently can't. So make more money (there are lots of other better sources of how to do this; if you want to delve down this road, reply or PM and I'll provide more resources).
3: How confident are you that it will happen before you die? Given the number of years of additional life you are buying a chance at by signing up for cryonics, the extra chance at preserving your identity and 'coming back' via cryonics may still be worth the extra cash. But that depends on the probabilities you assign to the various relevant factors (chance of singularity during lifetime & chance of cryonics resulting in extended life, mainly).
1) I value my life more than the lives of 4-8 strangers, as demonstrated by the fact I haven't committed suicide to donate my organs. Based on the reading I have done so far, I can't realistically assign cryonics a greater than 10% chance of actually working, so the question is whether I value my life (discounted by a factor of 10) more than the lives of 4-8 strangers, which I don't. If Omega told me cryonics was guaranteed to work, I would sign up.
2) Making money without a high school degree, special skills, or Eliezer-level intelligence is more difficult...
An exercise:
Name something that you do not do but should/wish you did/are told you ought, or that you do less than is normally recommended. (For instance, "exercise" or "eat vegetables".)
Make an exhaustive list of your sufficient conditions for avoiding this thing. (If you suspect that your list may be non-exhaustive, mention that in your comment.)
Precommit that: If someone comes up with a way to do the thing which doesn't have any of your listed problems, you will at least try it. It counts if you come up with this response yourself upon making your list.
(Based on: Is That Your True Rejection?)
Edit to add: Kindly stick to the spirit of the exercise; if you have no advice in line with the exercise, this is not the place to offer it. Do not drift into confrontational or abusive demands that people adjust their restrictions to suit your cached suggestion, and do not offer unsolicited other-optimizing.
To alleviate crowding, Armok_GoB has created a second thread for this challenge.