Hey Rosscoe, I kind of see your point, but consider all the factors....

-It was a charity concert, so they had very little money for marketing.
-Tix were only on sale for a month.
-35000 is not exactly a disappointing turnout, its just that Colonial Stadium is just so damn big!
-There were a million and one support acts, which actually turned quite a few people off because they thought that BJ would only do a short session.

I'm fairly confident that with a successful album release, followed by a full-blown Bon Jovi concert, watch the people flow thru the turnstiles in their masses.