Infinite XP rewards loop question

[X-FREEZE-OFF-X_PSN]

Someone in chat wanted to know if you can stack spins or if once you reach the extra 25K in XP if it makes you spin?

I'd like to add the following:

If you can't stack and you're at 24,900 in extra XP and you play a Moment for 1,000 XP; what happens to that 900 in XP?

[Blind_Bleeder_PSN]

Why stack them? They can be earned infinity times.