What is the max amount of points you can have and still be able to do an Amy Quest?

its 500k^^

but all of my hard-earned monies! i dont want to spend that much just for some achievement.

Does it count the sP you have in your til?

You don't have to spend your sP just have a friend put up a trade and bid your points on it...when you are done, cancel the trade :p

That is if the achievement is working now :p