I've always the feeling that my investment in computer hardware/software was somewhat a waste of money; you see, usually I get a pretty descent machine and stick with it for at least 3 years; so every 3 years I spend a lot of money to get a new one and I didn't get a direct return from my investment (not to mention that most of the day it keeps turned off), and to be fair, I should take internet connection fees into account.
Since I started working from home I may say that this is the first time I am getting a direct¹ (and measurable) return from this investment. It's even better, now it's easier to justify new hardware, software and other gadgets to the financial department, i.e, my wife :).
In other words, now my computer generates income and I feel compelled to invest more money to keep it up to date.
¹ I mean, direct, because I always studied a lot in my home computers so, at least indirectly, they always gave me a financial return (even tough it is hard to measure how much return I got).