something like 10,000x more expensive than oil, so yes, price is a bit much.
there are probably a large number of factors causing that though, such as the willingness of people to pay such a price. and given the convenience, it is easy to see why.
doing some maths though, the cost to print per page for my printer, assuming maximum pages printed (and offset some by using the toner saver feature), it comes out to a cent or two per page. i probably have enough to cover that in the small change i've got saved up in a jar.
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There is no shame in not knowing; the shame lies in not finding out