I see how supply and demand are giving a real price to something that supposedly shouldn't have value.
TestNet has always been a bit weird because of its paradoxical nature. It costs money to mine it but it should not have a value!
But I still wouldn't call what you are witnessing "demand" though. It is not exactly a market we have for TestNet coins. It has less than 100k satoshi 24-hour volume (ie 80 bucks/day). Even the worst shitcoins have a higher volume.
Currently, Bitcoin Testnet3 is reaching $0.3 steadily. I think that before the end of this year we will see it above the dollar.
Every now and then there is a scam running in the altcoin world where they swap some shittoken for tbtc and that pumps it to about 600 satoshi (again with the same low volume) and then it comes back down.
You are overthinking it in my opinion.
It is one of the oldest currencies in the entire crypto world, and when you least expect it, its price will skyrocket.
It is not exactly a currency since it is not used as a medium of exchange.
As for "skyrocket", little to no volume markets can't be referred to as "skyrocketing". I checked the market and with less than 1 bitcoin you can pump tbtc3 230%!
In comparison litecoin which is one of the oldest cryptocurrencies has 5500+
BTC daily volume and 1
BTC would affect the price in 1 digit percentage.