You forget that if you could earn 50x the price regularly, then there would be people willing to invest in say batteries, and those people would compete and bring the price down.

Of course, if it only happens rarely, there would not be enough money in it, but then it wouldn't be a problem for the home owners either.

Also note that while electricity is expensive to store, heat storage is actually pretty cheap. It works much better at scale with say a district heating system where you can economically do seasonal storage. But you can do it on an individual level too over shorter time spans.