It is possible to slightly change the User-Agent string
Right now the string is something like: "/Satoshi:0.9.1/" or "/Satoshi:0.8.5/"
List of nodes is here
https://getaddr.bitnodes.io/nodes/1407404879/?q=United%20StatesJust change your bitcoind and set this string to "/Satoshi:0.9.1-Donate-1MyBitcoinAddressForDonations/"
(this can be even configurable option in .conf file)
Everyone will see that the node is really exists and connected
In fact, I do not think that fullnode owners should ask donations. The rest of network is obliged nothing to them.
I am extremely curious why ALL the nodes are not up to date and doesnt this effect the network as to version of bitcoin... Now I am totally lost and confused about this whole updating client thing? What are the downside to not running the latest and whats the point up updating bitcoin when more than Half of the nodes are not updating.