Indeed. I have a friend who swears by the insect bite extractor, but I'd bet my fortune (so, about $3.85) that it's almost entirely psychosomatic (insert rant about why the placebo effect is a dangerous and elusive phenomenon). The lack of efficacy will be exactly the same as the snake kit, just on a different (and hopefully not life threatening) scale.
Unfortunately/fortunately until we allow high volume double blind peer review testing on human subjects, it's all pretty much anecdote,  data.

I'd prefer to see @REI-JohnJ  not sell either kit, as REI is giving implicit endorsement (which will eventually feed back into reputation if an incentive is needed), and without any evidence for their working they represent the thin end of a wedge pushing people to trust products that don't work.