Hmm, so this is coming from a person who only had to pay 10k USD for their MBA. The reality is that most of us face an MBA option of many times that in costs.
I will say this, if you don't have an MBA from a top 15 school, your employment options are drastically reduced. That being said, if you're doing your own start-up and you want a well-rounded business education, does it matter that much?
Ultimately, the value of an MBA is significant but the decision to undertake one is very personal. You have to weigh your own value for education with the cost you'll incur.