Could be different reasons.
As mentioned, supply and demand.
Parts shortages.
A US tariff could cause DJI to jack up prices in other markets in an attempt to recoup any losses also.
I am lucky, I grabbed mine the moment it came out as I had a feeling that import problems or price increases could be coming due to the trade war climate and other DJI ban issues.
DJI.com now has the E @ $5758 and the T @ $8598!
The T is now heavily encroaching on the price of a M30T.