i dont know you Dr. Bakker but i know these kind of practices are common.
For example Klinghardt reccomends a mineral supplement that i think is sold thru an affiliated online storefront that he may or may not own. They sell this small tub (maybe 4 or 8 oz) of minerals for ~$50 last time i checked and the minerals in there may have cost them $2. i know this because all of these minerals are now avail at places like PureBulk or BulkSuplemnts dot com. I understand that the doctors need to make $$ just like everyone else but i would have a ton more respect for Klinghardt if he charged $10 for the minerals and instead maybe $40 more for his consult.