I can easily earn a huge profit by trade 3-5x energy at one point in time, to get 1x energy at an other.

As an example, in my zone, if someone provided 1x energy at 7pm, and I repaid that by providing 3x of that energy at 3am, I would still earn a profit of about 25%.

The price prognosis for tonight is even lower, so I could trade 1x for 6x and still make a nice profit from the price difference.

So you're saying that a solar storage system which costs a fraction of a nuclear system is way better because you produce most of your energy during high demand and can move the rest rather than producing most of it at low demand times?

Yes - amazing - the reason prices are spiking is because supply is unstable and unable to support demand - and will be even more unstable in winter. Great for people selling electricity from renewables (although EU is capping their profit for 'fairness') but sucks for consumers.