[forgetfulness]

A $500 won't even get you proper training or a certification from the vendor of that massive tool and/or service that your business relies on, that's why it goes unused. It's large enough that you feel like blowing it on a Coursera course or a book feels too little and small enough not to be of actual importance.

[the_only_law]

Can I blow it on books? That sounds like enough for two of the ridiculously overpriced books I constantly eye.

[maerF0x0]

Dang, what kinda books you eyeing?

Knuth's set was the most expensive one I've bought recently