I have a question: what's relative advantage and disadvantages of having a node on VPS versus on Raspberry Pi ?
VPSs have 100+Mb/s lines, connected through nice backbones, which one doesn't have at home generally. Also, they have enough RAM to serve thousands of private nodes at once.
RaspPis are dirt cheap, but can get the job of saturating a modest home internet connection done.
We do need both: an interconnected, fast, robust core network, as well as loads of private / "semi-public" (pull-reachable) home user nodes.
Since hallmarked nodes will receive more incoming requests, should all public nodes are hallmarked ?
I would say so, yes.
Add: Oh, innovation. A DDoS on dgex. Meanwhile, we're approaching 1e-4 BTC/NXT territory...