Since you noted it, it’s actually very much part of my point. Tesla engages in price segmentation for replacement key fobs because they have key control. Perhaps even more aggressively than most other automakers short of VW Group. When done well it’s invisible to the user. I suspect by your (polite) comment that you may not be aware that’s going on here.

Premium users pay $300 to replace the fob on their Model S / Model X. Mid users pay $175 to replace the fob on the Model 3 / Model Y. And an entry level option exists for the cards. Plus programming fee. Handling fee. Local taxes. Processing fee. Etc :-)

Without control of their PKI anyone could self program a replacement for a few dollars as is the case with the garage door market.

As an aside, I find the fob useful for booting the car up prior to getting in, rather than waiting 40 seconds before the fly-by-wire shifter starts responding to commands to put it in gear.