Moi aussi. My original impetus for going to business school was the realisation that there was a lot I didn't know about running a business, strategy, marketing, business development, finance, cash flow planning, accounting, cap tables, negotiation and all the other little things that add up to a successful venture. I was a CTO at the time, and I was exposed to all this sort of stuff during interactions with the CEO, COO and other board members.
What I didn't realise until after I'd graduated was that having a better understanding of business would effectively make me a better product manager/designer. When you can combine an understanding of business with an understanding of technology, the whole is greater than the simple sum of its parts.