Given the frequency and popularity of these "math texts for programmer audience" threads on HN, I think there's a solid business model where programmers pay a onetime subscription fee for unlimited email/hangouts access to a math professor.
The problem with learning math all by yourself is, to quote my favorite math professor- "math is a foreign language".
So its a bit like trying to learn chinese sitting in a non-chinese setting, with only a chinese grammar text. You are simply not going to get very far. Far easier to buy a plane ticket to China and surround yourself with Chinese speakers, so you learn through osmosis - which is what the university experience is all about. But not everyone can take time off and go to a university. So then, atleast have a Chinese mentor on call, who can guide you through the difficult parts, tell you why things are the way they are etc.<p>I'd be glad to pay $1000 for a 1year unlimited email access to a math prof who can help me with some of the harder portions of measure theory and Banach spaces. Sign up enough students like myself and you have a lucrative gig.