A Jesus Question

So I've always held the notion that it is only fair for God to experience humanity. That is, if he expects us to be "good," he ought to come down here and give it a whirl himself, just to know what he's truly asking. However, if Jesus was that divine manifestation, then it wasn't exactly fair since he could do all the miracles he wanted. One could counter that he did them not for himself, but for others out of compassion and sympathy. OK, so if that's the case, then why isn't it happening now? Surely our God still feels compassion and sympathy, right? So why did he perform miracles then and not now, or before he came?