Any refund will be at the $ price, so a $6k miner would be a refund of about 7.5 btc, or about 0.375btc per share for this GB. Would be a good scam, take btc, wait for value to rise, don't deliver product, refund a fraction of the bitcoins. Not saying this was a scam just saying that it doesn't harm Hash Fast whatever the outcome.
Except that's not
actually a refund. If we paid $6k in USD then yes, that would be a refund. But we paid in bitcoin. A refund is returning to the buyer what they paid, which here is far more than 7.5 btc. I also seem to remember hashfast confirming that refunds would be in the amount and currency of the original payment, although I can't find that at the moment.
I found it in Hashfast website on MPP program:
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If I didnt pay in Bitcoin, how do you calculate the purchase price under the MPP and compare it to the amount Bitcoin generated?
If you paid in USD or other fiat currency, HashFast will base the calculations on the BTC to USD (or other currency) exchange rate we gave our customers the day of your purchase.