I bought all of my rune pages with ip since I bought all champions (also with ip), and I like having multiple pages as I fiddle with them for a specific champion, which I won't be playing for a while and otherwise would forget that perfect combination of runes/keystones.
But I can also understand the frustration people feel when they think about all their empty rune pages with the Runes Reforged update, as you truly don't need as much when you can freely edit them in champ select.
All in all I find the change fair though, because as that rioter mentioned it is purely convenience now to buy more rune pages which makes the additional cost reasonable.
On the matter of fairness if rune pages weren't to be refunded, there is one important point people are forgetting: People say they wouldn't have bought additional rune pages if they knew they would be freely editable, but at the the time they purchased them, they WEREN'T. People bought them for a specific purpose (having competitive advantage/equality with preset runes to adapt their playstyle), that purpose will be gone, but during all the years the additional pages served their purpose well. You wouldn't try to refund your 10 year old car which runs on gasoline for the full price either, just because there is no gas left and everone is driving electric cars.