HN is a forum where increasingly I see posts every single day about the high level of misery in tech / how can I get out of this rat race / high levels of stress / undervalued / etc etc.
I charge £500 a day. It's not much compared to some of the rates on here, but I work with lovely, interesting clients in the non-profit sector. My clients love what they do and I do good work for them so they love what I do. I have long term, low stress, friendship-like relationships with my clients, not shouty / nasty / high stress ones. I've done this work for 12 years, and had to work with maybe a handful of assholes during that time.
FWIW I think there is a "lower budget bar" under which demands are insane for the money being offered, and we should all avoid this work unless we actively want to take a race to the bottom. But - I think there is undoubtedly a "higher budget bar" over which the stress level and expectation is made exceedingly high. This (I would imagine; I don't know, I've worked in non profits my whole life) is probably also equated with sector - if you're in a FinTech environment I would imagine you're looking at high budgets but also an insane number of highly pressured assholes shouting at you all the time.
What am I basically saying? I guess - yes, charge enough (and this is probably more than you think it should be) - but also, look at the bigger picture of your work / sector. Think about happiness, work-life balance, client motivations, etc - and use this to inform what you charge and how you charge for it. That'd be my advice.