For example, another thread on equipment for moving hives just induced me to look up a hand-cranked platform lift I used to have where I worked. Any guesses as to what banner ad I've got at the top of this page now? It didn't take them two minutes.In many cases the banner ads you see may be context driven. If you look at a lot of threads talking about forklifts, pretty soon you may be seeing banner ads for forklifts.
I'd much rather see banner ads - even for products I will never buy and might object to - than pay a subscription fee for Beesource. One way to look at it is that I am extracting money from the vendors of those possibly offending products (in the form of avoided Beesource subscription fees.)