tBTC is worth exactly $0/tBTC
This is important to know @killthebanks. You offered a small payment for Testnet Bitcoin, but you're not supposed to pay for them, as they're not supposed to have any value:
Testnet coins are separate and distinct from actual bitcoins, and are never supposed to have any value
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There have been three generations of testnet. Testnet2 was just the first testnet reset with a different genesis block, because people were starting to trade testnet coins for real money.
Paying for Testnet Bitcoins will ultimately lead to another reset.
but it's quite expensive to mine nowadays due to the high diff and low block reward
That means many people are spending quite some money on mining testnet. I didn't expect that.