Well, because the buds are for items that can also be bought with gold.
The orchids are for limited, free items. If there's lots of limited items, they'll be cheaper, thus, less inflation.
If you can get lots of the unlimited commons, then you can just sell them for profit which goes to inflation.
And yeah, my profile caught you cheatin' on it. It aint givin' you no sweet lovin no' mo'.
But I treat your profile riihiiiight. So it gave me a bud. ;D