Even if you can afford something that you can use, is it possible for it to cost too much anyway and you don't bother?

So I have a two-story house, and for each story I have a robot vacuum that keeps my extensive carpeting, which is actually quite expensive and beautiful, extremely clean. It's incredibly interesting to watch, and it is very efficient and doesn't consume any of my time. I like these things; they weren't very expensive. However, at the moment I have nothing for my stairs at all, which is also carpeted. I need something. The units that are available for my stairs are ridiculously expensive. I'm not sure if they work all that well or not, but at least one of them, which is over $1,500, seems to work quite well. I still haven't purchased it, even though I can afford it, because I just balk at the idea of spending $1,500 on something like this, even if it's worth it. It just simply seems outrageously expensive to me, and I don't think I would enjoy it, and I would feel sort of stupid after I spent that much.

Should I buy it anyway?

Even if you can afford something that you can use, is it possible for it to cost too much anyway and you don't bother?
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