Quantum suicide seems like a good idea to me if we know that the assumptions behind it (both quantum and identity-related) are true, if we're purely selfish (eg don't care about the bereaved left behind), and if we don't assume our actions are sufficiently correlated with those of others to make everyone try quantum suicide and end up all alone in our own personal Everett branch.

Fortunately, if you combine the second and third potential problems you end up with a solution that eliminates both of them. Then you just have the engineering problem involved in building a bigger death box.

However, I might have the same "It's a good idea, but I am going to refuse to do this for reasons of personal sanity" reaction as I have with Pascal's Mugging.

I hope so. Your position is entirely consistent - I cannot fault it on objective grounds and what you say in your post does directly imply what you confirm in your comment. That said, the preferences you declare here are vastly different to those that I consider 'normal' and so there remains the sneaking suspicion that you are wrong about what you want. That is, that you incorrectly extrapolate your volition.

On the other hand the existence of people with the preferences you describe here is a great potential boon to the rest of us. Whenever parties have vastly different values there is the potential for trade between them. And the difference in values between those that care about measure and those that don't rounds off to absolute. When you act on your preferences we can essentially just inherit all of your stuff in exchange for a (from our perspective) token probabilistic payout. Everybody wins!