I'm the exact opposite - good sleep is of the utmost importance to me, and I will definitely "spend money on [insert mattress, pillow, sheets, or other sleeping paraphernalia here] for the experience".
People spend like ⅓ of their lives in bed. With that fact in mind, and knowing how proper sleep can greatly affect your day - and by extension, your life, since you sleep every day - I have no problem justifying the expense of a top notch mattress. In fact, I have a hard time justifying NOT spending the money... I can't think of a single thing that, dollar for dollar, has as significant an impact on my life as a bed does.
I just can't see how anybody can justify cheaping out unless they're totally broke and can't afford *ANY* luxuries or savings. As passionate as I am about brewing, I would sell all my gear (about $6k retail, in my estimation) and stop brewing if that's what was needed to afford a mattress. Hell, the impact it can have on one's day-to-day functioning is so great that I'd consider it an investment. An essential investment. So much so, that investing in my sleep makes it far more likely that I can both have an expensive, high quality bed AND still afford to brew with all my shiny brewing bling, as it allows me to be more productive and more effective at everything I do, thus even allowing me to potentially *earn* more.
And I am being 100% serious. :fro: