They want to make sure you pay at every single point where you might think "PANTONE®". So in addition of having to buy the PANTONE® sample book in order to actually know what the PANTONE® colours are, you now need to pay to reference the PANTONE® colours in a Photoshop document so that the receiving party knows which PANTONE® colours they need to get out of a printer.
If they could make you pay for sending an email containing "I need the background to be in PANTONE® Red 032 C", they would.