Because the profit (both absolute dollars and margin percentage) is higher up the line. Tesla's main problem at the moment isn't selling more cars, it's getting as much profit out of each one of the limited number of cars it can make.
What I think happened is Tesla has seen how many general production reservation holders have surprisingly opted for 85kWh and Performance variants and realized there's more of a market at $100k+ for the car than they had realized.
My prediction is they find ways to offer $110k - $120k variants. 100+ kWh battery and Super Performance options come to mind. We already know they've been testing sportier suspension setups.
AWD would be great, but I don't see it happening given the need to recertify crash tests. That's a lot of metal to add to the crumple zone. I'd love to be proven wrong though.