Everything you purchase or expend resources towards is an 'investment'. I bought the car expecting to get an ROI in the form of transport from A to B, fuels savings, enjoyment, customer experience, access to new technology etc. but part of that calculation is depreciation because that defines the real cost. The 25% depreciation in 18 months of a used vehicle already makes it a poor ROI, the trade-in valuation is just a slap in the face on top.Three thoughts; 1) Cars are [typically] not an investment. Thinking so is just going to get you frustrated. B) Used car market has changed A LOT in 18 months. Single data point, I was offered $64k USD for my '20 about 18 months ago. Now, I'd be lucky to get $40k. C'est la vie. 3rd) Tesla is in the new car market, not used car market. There is no incentive for them to be competitive. Go to a 3rd party used car buyer if you want top dollar. Better yet, sell it privately.
This has been a great exercise in turning a potential new purchase into a sale and bad customer experience. Again, what is even the point of such a bad offer if not to offend the customer.