Is there a way to do a comparison of the "old" BitCoins versus new? For example, let's say Nakamoto mined 500k coins early on, then stopped. That would mean there's a wallet.dat file out there with 500k BTC. Is it possible to check the idleness of BitCoins? If there's a large percentage of Dark Coins out there, then is there a danger of a pump and dump?

Thanks!