There have been past events (loans from "family friends" and the like) where a relationship established prior to college was a key factor and exempted actions that otherwise would have been violations. I recall this being a specific event here about 2 years ago, and the NCAA investigated and specifically said that there was no violation because the player and benefactor knew eachother prior to college. Please don't make me look them up...
Obviously TS and TGII were more than acquainted with his father beforehand, and they were the ones giving money. Which makes it even more dubious.
If you're going to claim it was a promotional thing -- it would seem to me the burden of proof is on the prosecution in that case. Not only that, but can you prove there was anyone at that party who didn't know Ginn Sr. before his son and Troy came to The Ohio State University?
I don't know about you, but I'm not terribly knowledgeable about exactly what happened in this specific incident. If such proof exists, then there seems to be a dichotomy. But again, the burden of proof would be on the alleging party.