For non-monks/FvS, fast method: 2 purps/min
Fast method to collect purple coins for the DDO Winter Festival, Risia Ice Games.
All classes, the only prerequisite is that you have Epic Destinies (ED) and you have some destinies unlocked.
You need a certain amount of jump skills and general running speed. I increased my jump and speed by twisting in some enhancements from the 'Shadowdancer' and 'Grandmaster of Flowers' EDs. You can also use heroism & jump buffs. It is also very helpful to aquire the Phiarlan Pendant of Time (150 Phiarlan favor) for that purpose.
Most importanatly you need some sort of propulsion like the Heap of Faith form the 'Exalted Angel' ED. Because you need to activate it twice and it has a short cooldown, you need need to jump up from the mast before you fire it.
Getting onto the mast requires some practice, too. Because you have to stop right on top of it.
After you've collected a coin switch instance because each coin needs some time to respawn.