Auctions for anything in person would be great. E.g house and car sales are usually fixed via a bank transfer that has a settlement period. Why not transact with BTC and drive away no more to pay!

You get paid dividends in BTC if you are long the TH1 contract, or if you are short you must pay the mining dividends.

So when it goes to zero at expiration, you can have more BTC from dividends, than you spent on the mining contract.