I run a bitcoin node (ranked usually in the top 200 on the leaderboard: https://getaddr.bitnodes.io/nodes/leaderboard/ ).  But it is a bit of a beast and I often seen 400+ connections.  And the last non-stress test from coinwallet.eu when they released the free btc tripled the load on my server.

I also run a masternode on Dash (https://dashninja.pl/masternodes.html ), but that requires a 1K Dash investment for the masternode to have any remuneration.  I make about 2.5 Dash per 5 days.  That covers my cost for the Dash masternode and bitcoin node.  It is nice to get something back.