That's cool, but you could also build an MVP using PHP and MySQL on cheap shared hosting or a cheap $5/month Digital Ocean instance. Unless you are on the Microsoft stack, you probably aren't saving a ton of money that you couldn't save by making different decisions.

Probably the more valuable opportunity in BizSpark would be to get any extra marketing out of the relationship with Microsoft. Being a "success story" can get you press, links, etc. which is very much more valuable than saving money on hosting.