Note - The results may differ in dollars or euros.
Prestige - Price - Prestige per £
750 - 69p - 1,086
1,800 - £1.49 - 1,208
5,000 - £2.99 - 1,672
12,000 - £6.99 - 1,716
25,000 - £13.99 - 1,787
67,500 - £34.99 - 1,929
140,000 - £69.99 - 2,000
This is made sneakier by the fact that the more Prestige you have, the more you are likely to use it, thus putting you in a position where you are more likely to pay for more etc.
Evergreen, you have my respect and out of interest, how many of you have taken the Sorting Hat challenge, and how many are in Slytherin?
(I ended up as a Griffindor. Still don't know how...)