Since I joined in June 2020, I've submitted prices of everything I've bought, and I did so because I found it useful to keep a record here of what I paid, and I figured others might get some use out of what I paid for something, especially if I later traded the card. So, I was a big supporter of submitting prices, even if they don't stay up with the market.
I'm not a supporter any longer of using the tcdb pricing at all, but if you find it useful for your own reasons, go right ahead and submit what you've paid, regardless of what the site determines as the "price."
I love to trade! Check the top couple of paragraphs of my profile to see my general trading desires. If you're uncertain if I’ll take a certain trade, message me and we can figure out something.