I’ll give my feedback, which I feel is overdue at this point.
We have a facility here thanks to @David and the many contributors on this forum where we can both ask for and offer advice on basically any activity you can think of. It’s all done willingly without the expectation of monetary compensation. People are just willing to share what they know, offer advice when sought, which helps both the forum and the site flourish.
Use of the Intervals.icu site is offered free of charge and those of us that ‘support’ it help ensure that it will remain available for all, including those who don’t support. We are getting a truly exceptional facility for an incredibly low price when compared to other sites offering a similar product.
You have been a member since March 2022 and have posted links to paid user/training guides. In effect you are making some money from this facility, yet you don’t support it. I think a minimum expectation for someone seeking monetary gain from this platform would be a recurring quarterly contribution of €10.
Further to the above, you claim to have “years of self-coaching and training with a power meter”, which I have no doubt is true. However in this post here from July you tell us your FTP was just fair compared to others in your age category. Your CTL was just 24. Your delf coaching doesn’t really seem to have gone so well. Maybe you have had a very steep learning curve since July and maybe there is valuable advice in your book, but forgive my skepticism to the claim the the book offers " value to professional cyclists and coaches."
Apologies from me, but I won’t buy a book or a guide made off the back of the help freely offered on here, produced by someone who doesn’t offer the small sum of €10 each 3 months to help keep this site up and running.