I don't get Skype at all. Who would pay for that service?
Skype is a fantastic way to keep in touch with people world wide, and for most people most of the time it is a free service, video call, calls and messaging (Either singly or groups). All Skype to Skype communication is FREE PC to PC, PC to mobile as long as it's Skype to Skype.
If you have family or friends abroad or any distance away (My kids for example) then Skype is a fantastic service, millions of people use it daily.
I can sit at my PC and video call my eldest daughter 200 miles away and she can show me her pet cat climbing up the curtains, I don't need to use my phone. But like all tools, if you have no reason to use it then it's useless.
So no need to PAY for this service, Skype to Skype is FREE
You only have to pay if you want to call or message someone who isn't using Skype that you have to pay, and the reason for this is simple, Skype has to pay if someone dials a telephone number or sends a text that goes outside the system, so they pass on the charge (And hopefully make a small profit).
So if your question is slightly different and said "Who would pay to use some of the paid services".
Then it's up to you, I have a Free subscription of 60 minutes with my Office 365 service.
I had to phone my solicitors the other day and I wanted my wife and boy to be involved, yes I could have easily used my mobile on speaker, but I choose to use Skype to dial the number so I was using a desktop microphone and much larger speakers, so any one in the room could hear clearly and speak if needed, far better and it cost me a couple of minutes of my monthly free subscription.
Others use it as their main way of calling people worldwide full stop.
I chose to subscribe to a Skype telephone number, this gives me a "Landline number" I can give out and people can call me, I can answer the call on my PC's, Xbox One or mobile (Windows phone or my work Android).
No need to pay for these services, all comes down to choice.