While I can empathize with the frustration and I would no doubt be pissed if I took delivery in the last few weeks...this is really an extremely common practice in the auto industry. Tesla just doesn't hide it.
Anytime there's an exciting new model launched, the first adopters ALWAYS pay the most. It's generally because of a lack of discounting, and in some cases even significant dealer markup. At Tesla, there are no discounts on price, and no dealer markup. All price adjustments due to supply/demand are reflected in an ever-changing msrp.
As I've mentioned before...I ordered a Range Rover Velar on launch day. When I took delivery I paid sticker price. No negotiation, no incentives, no lease deals, no nothing. It was a brand new model and I received one of the first in the country. At the time I didn't know what the demand curve would be like and I really wanted it so I went for it. A few months later it was obvious they had no backlog and dealer lots had a bunch of them. A friend went and test drove one and they were offering significant discounts (more than $3k off).
As supply/demand change, Land Rover (and every other auto automaker) discounts the price at the time of sale via dealer incentives, etc. Tesla just adjusts the msrp accordingly. Regardless, early adopters ALWAYS pay the most. If you think everyone is paying the same price for other non-Tesla cars simply because their msrp doesn't change, you're very wrong.