You've probably already thought about this, but the corporate market is pretty large for language learning. I work for a big company with offices in many countr

You've probably already thought about this, but the corporate market is pretty large for language learning. I work for a big company with offices in many countries so they strongly encourage learning other languages. And the corporate expense department won't blink an eye at spending a few hundred dollars for language learning software. If you get a reputation for being the best product in your space, it is worth quite a lot more than $5 per customer.