FUNCOM will make it so treasure room price only affects the number of “waves” you get, not the type of purge. The only convenience this will bring is player/admin wont have to constantly change Purge difficulty settings in the menu.
But amassing 50 000 wealth at the noob river wont trigger a Frost Giant purge - you will still get measly Exiles purge, but there will be like 9 waves of them.