@Surivere These are about 10% with TH8 as Roces stated. I spend hours farming these to make money and personally they're worth every penny of 80-100k comparable to other items that take the same amount of time to farm and are high in demand.
These are used for several Quests in the new area and if someone doesn't have the time, will, ability or patients to farm them then 100k is cheap, after all Time is Money!
**Note, dropped from all twitheryn type mobs, higher level mobs do have a higher drop rate but are less easily solo'd
Mantid Forelegs and Chapuli horns are much rarer than These wings, And they're sitting at 3~4k and 10k respectively.
Don't kid yourself into thinking these are worth 60k cause they're somehow "Difficult" To farm, they aren't. The only thing driving their market ATM is the fact they, with their Scales, are used in many a quest and Coalition assignment
they're laughable easy to farm, if it wasn't for the above, They'd be 3-5k like Chapuli Horns
Easy drop from Twitherym's everywhere. Just because 5 are used in a task doesnt mean people will(or should) pay 100k each for them. Please have some common sense when buying these right now.