you saved potions for inos flowers? that would take hundreds upon hundreds upon hundreds of potions to place in, so 2 possibilities here:

1: you know someone from oasis who gave you that advice- same way a certain mod in my server knew of this info and decided to encourage us to spend for worthwhile rewards only to then take number 1 spot in the closing hour for free, using his potions he knew to save because he was given the knowledge months before the event was even implemented

Or

2: you paid

^ neither of which require skill, one is unfair inside knowledge having warning many many months in advance, the other is good old fashioned money