Price points are relative. Maybe it’s different on Nightslayer, but on Dreamscythe the price was 67g-ish most of the time until 3-4 weeks ago.
When Phase 6 date was announced it climbed to 90ish, then spiked during the first week of phase 6 when people who didn’t plan/buy ahead were stuck having to buy high. But you seem to be describing an elevated price as the ‘norm’ which it really was not.
The drop to 65g is really just a return to norm +/- a few percent. As phase 6 goes along personally I’d wager the price will continue to drop - though I might expect a slight bump back up in pre-patch though how much will depend on how long pre-patch is.