>At the same time promoting their own books or paid speaking.
hmmm... if you think ANYONE is making money speaking about beekeeping you are mistaken. I can make more in two hours working my "day job" than I can make in a whole weekend of speaking, and I have a lot of other things I need to be doing...
...and I'm sure it's the same for anyone one else out there speaking.
I'm not sure if the "book" thing is addressed to me, but I tell everyone to read it for free on my website. They just don't listen. I also tell them to stop buying queens and raise their own queens, stop buying foundation, stop buying pollen substitute, stop buying treatments. What snake oil do you think we are selling?
The treatment manufacturers, and the bee suppliers on the other hand, continue to sell Apistan (that has not worked for well over a decade) and Checkmite (that has not worked for a decade) and many other unnecessary and counterproductive things. Despite that fact that the rest of the world other than US, UK and Canada have OUTLAWED the use of terramycin because it is NOT effective at clearing up AFB and have OUTLAWED the use of Fumidil because it causes birth defects and despite recent research that proves that Fumidil makes bees susceptible to Nosema and terramycin makes bees susceptible to AFB and EFB, these products continue to be sold.
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033188
If that is not snake oil, then I don't know what you mean by snake oil. Snake oil by definition involves a profit selling something that at best, simply does not work and at worst makes the very thing it is intended to help get worse.