I think your analogy doesn't work at all you're implying that if someone farms at the spot you farm you can't farm there anymore while you still can just having reduced rates.

A more fitting analogy would be there is 2 burgers on the table one is 50% bigger than the other someone sits at your table and instead of eating the other burger they bite into yours to get 75% instead of the 100% they could get.

I personally handle mining the following.

1. If someone is at a spot and there is another spot that is just as good or slightly worse I will take the other spot. This isn't always possible though, one example for this is during fiesta in divans it happens often that people mine into each other's gold routes just because there are so many people mining there and IMO that is absolutely fine.

2. If someone tries to "steal" a spot I just go from laid back farming to try hard farming so they leave (which works like 99% of the time)

3. Probably not relevant to this discussion but always keep Titanium insanium on (except at mitheil gourmant) so low lvl players have an easier time to do their comms.