Yes, but even with a large % return on your fp contributions, you would still spend more fp than get back?
A level 80 Arc owner who places 50% of the total amount of FP's required to level say a level 50'ish Arc would get back around 200fp's in profit as well as the originally placed FP's. Also many level 80 Arc owners band together to make GB levelling groups who place their breakeven quantity of FP's in others GB's to get them levelled quickly, its not unheard of for me to place 10,000+ fp's in a single day and there are others with more time on their hands who will place many more than this, most of these invested FP's are returned within a couple (sorry 2 days) so if you have 30K fp's in your inventory you can happily continue playing like that every day without ever running out of FP's.
Its mainly for this reason that many players were screaming for a quicker solution to getting 1000's of fp's in at a time. The new system is much quicker but still has issues, for me the screens themselves are fine, whats needed is get rid of the diamond level up button, thats clearly there in the hope someone presses it by accident, do away with FP packs in their current form and simply replace with a single inventory pool of FP's and then have donation buttons of 50fp / 10fp / 1fp is all thats needed, first it comes out from your FP bar and then resorts to using your FP inventory, this way there's no need to break into a 10fp pack when you only want to spend 1fp (as you no longer have 10fp packs) and there was no need for the dumb study inno needed to make on players FP usage.
I really think inno are trying to hard to make a clever system based on general FP usage when they could of just given all the power of FP usage to the individual player to use as they please.