It's a huge amount and the best part? Some Bitcoins came from the wallet address marked as F2Pool by bitinfocharts, which may be early miners.
So these early miners have kept their 6.5k Bitcoin saved until now. 12 Years later, that's worth a freaking $230 Million Dollars.
If they already sold bitcoin enough to pay for mining cost, they are surely able to hold their rest for future. The cost of mining in the past would be cheaper than latest years like 2017 or this year. I am not surprised if they held their bitcoin so far but I feel surprised if someone (not miners) from the past did not lose their private keys.
At Bitinfocharts.com, after page 9, https://bitinfocharts.com/top-100-richest-bitcoin-addresses-10.html there are many addresses with above 1000 BTC to 2000 BTC. How many of those dormant addresses will wake up from now till halving and about one year after halving?