Are you doing the quarantine in a hotel, and if so did you book it through the Thai Embassy website? I'm looking at booking but when you follow the link for the Covid 'package' it's like a normal online hotel booking system mentioning free breakfast include and free cancellation... I was expecting it to give a price for 15 nights, 3 meals a day and transport from the airport?
I would have thought prices would remain high for some time. Airlines have taken a massive hit, staff laid off and aircraft parked up. Aircraft are designed to be in constant use and will require safety checks/servicing. Plus there may be empty seats/distancing. So fewer flights, fewer seats, lots of passengers= higher prices?