it is not that expensive to need "big money". and nobody is preventing YOU from buying an ASIC and mining bitcoin with it. the only problem is that others who buy ASICs believe in bitcoin whereas YOU don't and because of that you don't want to make that kind of investment!
Apparently you live in a very rich country and do not know how people live in those countries where the monthly income is $ 100. How many years will I have to starve to buy a miner? Count ...no i don't. i actually live in a third world country
but that is irrelevant. the problem is that you are confusing bitcoin with some sort of charity which it is supposed to let anybody earn it for free without any "work".
not to mention that whether or not some poor people can mine bitcoin or not has NOTHING to do with centralization of mining and "satoshi principles" that you are talking about here.... and that was my point.