A while ago I was averaging the cost of ink per mL and it worked out to about 10 cents per mL. Considering an average 1 Litre bottle of wine is about $10, that makes ink 10 times the price of wine.
What exactly is the difference between a "PC" and a "Linux box"? Or has this guy fallen prey to the marketing of Microsoft / Apple and using "PC" to mean "Microsoft Widows" computer?
If in any problem you find yourself doing an immense amount of work, the answer can be obtained by simple inspection.