To be clear, I consider myself an effective altruist.
> Very roughly, it costs 10 times as much as my house for 10 times the space
I highly appreciate the transparency! To be fair, I think your house is expensive (I suppose you live in a very expensive place! around here, you could buy 10 large apartments for that kind of money). Is everywhere in Oxford that expensive?
I do live in a developing country, and have a relatively comfortable lifestyle for my country. Still, I try to be frugal and avoid spending more than I need, even in everyday life. An EA that I want to support is an EA that is radically compassionate, open minded, pragmatic, altruistic and bravely focused on a better world; not one that is self-serving with sprinkles of charitable giving.
I also feel that self-vigilance, self-skepticism (and embracing criticism and improvement with an open heart and mind) is an important component of EA, which is what I'm trying to do here.
> At the same time, I think a norm where effective altruists should prioritize transparency so highly that a group of them can't spend their own money without making the case publicly would go too far.
I agree to an extent (although I plan to make my own giving as transparent as I reasonably can in the future), but that is specifically an EA charity, not private individuals -- as an EA org, I think they show commitment to effective spending and I think it's very reasonable they should embrace transparency.
From wiki: "Centre for Effective Altruism (CEA) is an Oxford-based charity that builds and supports the effective altruism community". This makes me less confident than I would like in supporting CEA over effective charities like GiveWell or other EA charities.
Please see this post (from me): Be simple and transparent, a heuristic
https://www.reddit.com/r/slatestarcodex/comments/yww9g6/be_s...