A Sybil Attack is defined (at least by Wikipedia) as, "an attack wherein a reputation system is subverted by forging identities in peer-to-peer networks." I don't believe my choice to run ten Classic nodes comes close to qualifying under this definition. Also, how many people have foregone running a classic node because they feared a DDoS attack or experienced one? I would argue that I am trying to deskew the stats -- and let's not forget that more nodes benefits the network as well.
i get what you are trying to say. but take it from another angle. is 2 people running 20 nodes each beneficial to the network. knowing those 2 people only physically need to touch and use 1 of the nodes each.
or is having 20 people using 1 node each (same node count) but where 20 people are in 20 different locations and each using only 1 implementation for real purposes.
i myself could easily (financially and resource ready) run 5000 nodes. but i choose to only run one node, i would prefer to get 5000 people to run a node (if they needed to run one for its true purpose) instead.
simply because you running 10 nodes on the same datacenter adds nothing to the decentralization premiss.
dont get me wrong i do understand your motives are honourable, but from a technical side. its not really as helpful as getting 10 people to run full nodes