is there a limit to how much stuff you can have signed? I'm not talking about bringing 50 things to be signed, but when you have 2 kids and you want something for each of them, like pillowcases and t-shirts, and then maybe a photo mat for yourself, the count could easily add up. Do they frown on multiple items, or smile and say "bring it on".
On a side note, make sure your items are clean. You may laugh and think that is crazy, but before our cruise last December, I stopped at a little dollar store near the port and picked up 2 pillowcases (I totally forgot about this while packing at home). I left them in the package - NEVER opened them. Turned them into guest services for autographs and when they were returned to me on the last night, one was not done because it was "soiled". I opened it and it literally looked like it had blood on it!
So check your stuff ahead of time!