指数差价合约展期 - 最佳实践？

For me, it depends on the broker. Some have fair rollover adjustments; others are clearly trying to gouge you. I usually let it roll if I'm with a good one, but if not, I'm out before.

I always close manually before expiry. The spreads some brokers offer for automatic rollover are just not worth it, and I'd rather control my entry.