? I don't get it.
What is your point?
I certainly might be wrong, but I think the point was something like this:
Currently, a $5.00 USD donation nets 10 Kyuubi days & 500 donation points.
The idea (as I think it is, because I had thought of something similar):
500 donation points buys you 10 kyuubi days
400 donation points buys you 10 pakkun / shukaku days
300 donation points buys you 10 katsuya / mando / gamabunta days
-or-
500 dp buys you 10 kyuubi days
500 dp buys you 12 pakkun / shukaku days
500 dp buys you 15 katsuya / mando / gamabunta days
Something along those lines. I am not sure that this is what the OP was thinking, but I had thought about requesting something along those lines. Of course, all the numbers above are strictly there to provide an example and are not intended to represent Fair Market Value for each mount.