The RP value of Traditional skins.

Tonight I received traditional trundle in the new mystery gift that guarantees a skin that is worth 975+ RP, and I received traditional trundle. The traditional skins are primarily owned by people who received them for FREE simply by owning the champ before their respective rework. Why and how are they valued at 975 RP when the actual champions that even have "traditional skins" cost less RP? Shouldn't the RP values of the traditional skin go down with them since its not a released skin and is technically the champion itself??

What do you think these skins should be worth? 975 seems ridiculous and I would like to hear some opinions. And while we're on the topic of skins, are you satisfied with the pricing of skins in general? Are there any skins out there (try to exclude skins that are extremely outdated) that simply don't justify the cost in your opinion?