A relevant part is that double the speed doesn't save the same time.

So e.g. if a download takes 100 minutes on 10MBit, you save 50 minutes by doubling the speed.

The same download would take 10 minutes on 100MBit, doubling the bandwidth would only save 5 minutes.

And on 500MBit it's two minutes, so doubling the bandwidth only saves one minute.

We are deep into diminishing returns here.

€58 vs €49 means an extra €108 per year. That's quite a sum.

In my case going from the 150Mbit/s I have to gigabit would cost me €35 extra per month, €420 a year, yeah, that's not worth it to speed up some background downloads.

I'm on Fedora, updates are frequent as well, but since they download in the background I hardly care about the speed. I see there's a new update, so I start the download in the beginning of the day. It finishes within half an hour or an hour or so, while I continue doing my stuff, and in the evening when I'm done I run the actual update if it requires a reboot.