Some of us might be rich, or get funding, or in the future it could be useful when training is cheaper.

Open source has benefits even if you can run yourself. You can read the code for understanding/insights. Other labs could replicate/build on it.

Maybe not now, but what about 10 years down the line?

Yes.

Yet, I couldn’t afford a PC to run the original Crysis when it came out, now the hardware isn’t an issue anymore