I can probably count on one hand how often I disagree with Gibby, but if you have been accepted to Yale, have carefully considered attending (as you should have done before applying), AND your family is very comfortable paying full price, why not? DS did not accept immediately, but did so before BDD. He had been on campus 2 weeks for YYGS (albeit in the summer) and had visited friends on campus during the school year previously, so he wasn’t completely naive.
ETA: OP didn’t ask about FA, but if that’s a consideration, absolutely wait. You have little leverage after you accept.