The advantages to the software purchaser:
1) You're a busy guy. If we critically hit you with a wall of text right now, you'll bookmark it and never get back to it. If you're honest with yourself, you know this, because you've got a backlog of things to read four miles long already. What's your RSS reader look like? Instapaper? I rest my case. So maybe giving you the highlights in a digestable format is a value add for you.
2) This is not a decision that is going to be made an instant -- there is an entire decisionmaking cycle, including research and shopping the solution you pick to your colleagues and experimenting and you get the general drift, which is likely going to take you real-life weeks. Your expertise on the problem area is currently "Not all that much" since you're only beginning the data gathering process. We can meet you where you are with the lesson for today, and when you're vastly more informed in two weeks (because learning this topic is, after all, your job) we'll send you more advanced information. Sure, we could drop everything we know on you right now, but you're not ready for it and reading it linearly will not make you ready for it.
3) Given that we're both businessmen here, we can both appreciate that we choose from mutually acceptable options, not all possible options. The software company has a lot of stuff available on the web pages for free, but if you want exactly the benefit this course is promising to you, then as a quid pro quo we would like your email address and permission to contact you. You, being a honest businessman just like us, are perfectly free to decline this offer, but if your counteroffer is "Give me all the goodies and I'll get back to you", our answer is "Not interested, thanks."
The advantages to the software company:
See above. No, really, the advantage is not "Score! We get to spam the heck out of Pavel!" We have copious data to prove that the statistical aggregate purchaser is overwhelmingly more likely to consume six emails in a month than he is to actually read a 20,000 word web page. We have surveyed buyers of enterprise software -- we know that many of them do not know what they want right now. We have had our sales reps talk to people, and we know that many of them expect to get handheld through this entire process. The email course gives the market exactly what it wants: information in a digestable, actionable format which will accomplish the goal of educating them and lead to measurable increases of qualified leads asking us to buy our software (or otherwise take the next step in the dance).