Found on Gaf
price per token
1€ => 1ct / token
5€ => 1,53 ct / token
10€ => 1,74 ct / token (recommended ! )
20€ => 1,6 ct / token
50€ => 1,85 ct /jtoken (Great Value !!! )
100€ => 1,25 ct /token
Is that a mistake, did someone fake it? If not why would MS decide to make the tokens in the bigger packs more expensive?
Edit: A Turn 10 developer posted this on Neogaf:
Hi all, just wanted to quickly clarify the situation.
The pricing displayed for Token Packs in Forza Motorsport 5 is incorrect. As a result, transactions are not paying out the correct number of tokens. We are resolving this issue immediately and expect players to see the correct pricing structure and accurate token values later today. Any player that has purchased one of these packs will be credited the appropriate amount of tokens when the issue has been resolved.
http://www.neogaf.com/forum/showpost.php?p=90728445&postcount=240
So, the pricings were a mistake.