Good reference is essential to any business. If you need fast answers to important questions, digging through dusty almanacs won’t do any good. And if you are writing—whether to a client or colleague—what you say needs to be sharp and correct; good resources can add charm to your words.
My local public library understands this. The institution recently installed a fast PC with 4 CD-ROMs to provide a digital encyclopedia, dictionary, and atlas for townsfolk. The setup is popular with school kids. If they can use digital resources for homework, why shouldn’t you?