As a general rule, no buffs will be granted to rare items. This is regardless of their status as Limited, Seasonal, Promotional, etc. In order to achieve a more balanced system of play, buffs cannot be guaranteed or handed out on a regular basis. This policy has been decided by the game staff and is not likely to change. However, if you feel that your case is especially strong, that is, you have numbers and evidence to support your conclusions, you are welcome to contact the game staff using this forum's PM system to discuss it more thoroughly. Keep in mind that the game staff cannot promise that your case will be followed through upon, as the game's balance will take precedence over personal requests for the sake of all of the game's vast player base.
In regards to this discussion thread, you are still permitted to discuss buffs to rare items, but these discussions must be placed within this thread.
Taken from first post of Balance Thread.