I'm actually curious about how that business works. We had a picture (remixed from Shaq's twitter profile page http://twitter.com/the_real_shaq ), with him in a Suns jersey. Presumably he has people both for his personal brand and also those for the team he leads. I doubt the Suns would care much about, for example, a pirate copy of his music or movies.
One thing is pretty clear: Shaq is authentic on twitter, but the account is managed and monitored by a number of interested parties. That is obvious when you think of him like any other brand, but has left me a bit jaded about it.
Honestly, I think your post is terrible. Didn't you think you could ask him first? Rather than "asking" publically? Your tweet to me reads like blackmail.
Blackmail, really? What were the terms of the blackmail?
I'm not saying the 140 char post is super clear. Part of the problem with twitter is an inability to increase the bandwidth of the conversation in-line.
You tweet essentially saying "its for charity, and if you want to be charitable let me know". If he doesn't respond, he looks like he doesn't want to be charitable, to the public. This is sort of like blackmail imho.