If Sebastian is able to maintain a high quality offering, then it should be fairly easy to become a for-profit operation - one could for example offer the testi

If Sebastian is able to maintain a high quality offering, then it should be fairly easy to become a for-profit operation - one could for example offer the testing results to various companies for a finder's fee if they hire someone (as the article alludes to), or perhaps offer a class first at a low cost of $10 (with 100K students, that's not bad beans), and then offer it for free, or perhaps (always my favorite to figure out how to apply), let students do a dutch auction bid for the class, etc.