Your site does not inspire that confidence so far. Here are some things that leave me disinclined to purchase your book even though I consider the price reasonable and am interested in the topic:
1. I don’t know who you or your co-author are, and I don’t know of any SaaS you’ve built that I’ve used or contemplated using. Have I used something you’ve made? If so, tell me!
2. Show me an example of the SaaS that the book teaches me to build. If I could experience what result I might produce, it’s easier to spend the money to learn how.
3. In light of points (1) and (2) not being satisfied, your terms of purchase are really scary. I can’t download a copy of the book to keep? You can revoke my access at any time? No refunds? I know I can reliably get my credit card company to issue a chargeback within a month or two if something’s not as promised, but I tend to read this kind of content more slowly than that. I want to make sure that I can continue to have it as I make my way through it at my own pace.
I hope none of that sounds like hostile feedback. It’s not... I’m someone who’s actively looking for this kind of resource. The price itself isn’t a problem, except that I can’t see what I’m getting, I don’t know your work well enough to know I’ll find this work useful, and you say you won’t offer a refund if I don’t find it useful. Plus you say you might revoke my online access and refuse to offer offline access.