Testnet coins are worthless. Anyone who sells you a testnet bitcoin is spreading the notion that they have value, and thus cannot be trusted.
They're not
supposed to have value, but the cost to mine testnet is real. It's not just one or two people; many people are buying testnet coins and that confirms the demand is real because they are not easy to obtain. People can place whatever value they want on anything, and clearly people are placing value on tBTC.
You're just speeding up the testnet reset.
The last reset was 10 years ago... I'll believe it when I see it.