1. (According to my short research) 300$ in 2013 are a bit below 400$ nowadays, so you also kinda gotta take that into account.
2. Low-end GPUs have been/are being attempted to be mostly replaced by APUs (at least on the AMD side) which kinda makes sense.
3. Normal pricing has gone outta the window ever since the NFT craze (or demand if you wanna put it that way) and now the AI craze.