This whole "gifting resources back thing" seems like a really difficult thing to do. Gifted resources come from your storage, IIRC. So that one planet must designate a significant portion of it's precious space to storage.
And so what if they get a research bonus? It will not compare with an empire's research. Their progress will be quite slow.
As for incoming resources, what good are they when you only have one yard?
Besides, if it is an intel game, you can just crucify them with Communications mimic and other attacks.
