The Raid Finder raid can be done more than once but you only get loot once - however, can you do the Raid Finder raid, get loot, and then do a 10/25 man raid and get loot in that too?
To clarify, can you only get loot once in all 3 difficulties, or can you get 1 set of loot in raid finder (but do it as much as you want) and 1 set of loot in 10/25 man and can only do one run?