Anyone who knows how to search for things on Google can uncover more useful information, and in less time, than interacting with the WA support community, which means the only useful things you have access to are the training vids which are passable, but not fantastic. The other selling point with going premium is the higher referral fee, but what good is that if you only sell a handful of WA memberships per year?
For starters they make no promises that what you will learn will be able to work on a regular site. The premise behind what they do is based on how blog-style sites work and generate traffic. Yes they do this in a completely different method. You can get traffic easier in a blog than with your web site. But since you "know what you are doing" already, you must have known that. 
As a quick follow up, I just received exactly the same email from WA regarding the second free website that I built a little while after joining as a free member. Also received several emails from them promoting their Black Friday offer of discounted membership. The price was a bit more realistic but still wouldn’t encourage anyone with an ounce of common sense to sign up. Incidentally, it seems that as I am still a free member, I am still able to have 2 free websites which I can create at my leisure. 😂

Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization (SEO), paid search engine marketing (PPC – Pay Per Click), e-mail marketing, content marketing, and (in some sense) display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.[citation needed]

It is my opinion you may be discounting the significance of your background and assuming others, with no idea as to how to even start such a journey, would easily know how to begin. So, to me, WA jumps into the fray rescuing the neophyte, is it perfect? Nope, but they are highly successful in laying an effective foundation on which further study can be obtained. From my perspective, for their concerted effort, I give them a resounding applause!!!
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. – Udemy is an online training platform where “instructors” can create courses and sell them to “students”. There are some extremely high-quality courses on Udemy created by high-quality instructors who really have made a lot of money online, but there are a lot of very low-quality courses as well. Most of the higher quality courses are quite expensive, sometimes exceeding $100. While the training might be good, the training on Wealthy Affiliate is excellent as well, plus you get all the tools, community, and support included as well. Once again, I believe Wealthy Affiliate is the better option.