None. Same as with the crazy magic item price increases.
It's purely a meta-reason.
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Thanee
There was a tiny bit of seriousness in my Toltec post, but in all seriousness I don't think it has to be all meta, and I don't think it has to be ONE reason. Perhaps like all economies, it is a complex system where it is often hard to explain WHY something costs what it does without knowing many, many factors:
- Churches do a LOT of charity work, and it doesn't take long to realize that Legendary Grubbins the Gonkerator can afford to pay huge bucks for the service - - yes, it seems like socialism, but it could happen this way. See it like a tax system, and high levels as the million dollar salary folks. Sort of religious "from each according to their ability"
- The weight of the soul idea - expressed seriously: What if the number of creatures you destroy, and their relative power, becomes a weight on your soul, and the raise dead must overcome this added weight. If you've only had three bar fights, quick and easy...if you've destroyed thousands of creatures, including Mighty Campulflip, it's tougher
- The opposing forces idea - mentioned above.
- The Game of the Gods concept - - the players and villains are like pawns in an elaborate game, the rules to which man has no access. But it is clear from what is required to raise higher level characters that one of the rules is that for God XYZ to get his rook back from the discard bin, it must cost more than to retrieve a pawn.
Frankly, the first one (economics) seems like it would be possible with no goofiness.
There are a lot of things in 4e that I think are difficult to not leave ambiguous and meta, but I don't think this is one of them