At this point in time, hallmarking your node would make you more susceptible to DDoS attack which would make you fall out of sync with the network. The network disruption is being caused by non-hallmarked nodes mainly relying on hallmarked nodes to stay in sync, but these hallmarked nodes are under attack and cannot keep up with the requests.
So it's a chicken-egg situation? Would be beneficial for the network to hallmark but with only one node and high volume not good at all for NXT that DGEX would be rendered unable to process payments. I think it's better to stay put, wouldn't you suggest?
I would recommend that you do not hallmark at this point in time. If you hallmark, you will come under DDoS attack. When a node comes under DDoS attack it loses sync with the network. But because it is still hallmarked, other nodes with smaller hallmarks and no hallmarks still request data from it even though it is completely overwhelmed and out of sync.
If you don't hallmark you might lose sync with the network, but you can always delete and redownload the blockchain and get back in sync. As long as you are in sync, you should be able to process payments.
Currently, everyone is trying to figure out the best way to deal with the DDoS attack. We could stop using hallmarks, but then we are opening the network up to zombie nodes. We could force everyone to use hallmarks, which would make a DDoS attack more expensive for the attacker, but it would also prevent legitimate non-hallmarked nodes from syncing up.
Because hallmarked nodes seem to be doing the majority of the synchronization for the network, we need more hallmarked nodes to distribute the workload.