LOL! 3G network is already quite slow and you guys want many useless pictures to be streamed over 3G network. You guys gotta remember, EVERY picture you take with the phone (screenshots, images saved) will get sent to Photo Stream (if you have the option turned on). This will eat up your battery usage ALIVE. Then you guys will start complaining why the battery sucks on the phone, why the 3g network is so slow, blah blah blah.
We all waste bandwidth one way or another, but we just need to cut it down as much as we can.
There are many flaws with Photo Stream right now and it's pretty much an useless option since you can even delete a few photos from Photo Stream easily.