Landy: The HLC's are just a bunch of elders who are able to talk to doctors about the possibility of alternative treatments. That's it. They aren't paid for anything - the costs of dissemination of any information to them will be negligible.
Landy, the HLC is only the visible part of the entire medical network that is necessary for the WTS to disseminate the information that the HLC is responsible for. To get an idea of who the HLC is, think of an baptized publisher in the field service hierarchy. That is where the HLC member is situated. Above the "unbaptized" ones - the elders who implement the blood policies at the mundane but essential level - with the targeted group of medical subjects - the JWs themselves.
Above the HLC guys is an entire medical network who establish protocol and organize liaisons with medical establishments and pharma companies. Rising up through the ranks of the HLC network could land, and has landed, the really slick ones into prominent international positions in the field of blood management. (Shannon Farmer, for one. There are many more) Each country has a branch of Hospital Information Services, most of them run by JW doctors.
Not only that, but the amount of material produced over the past seven decades by the WTS concerning blood and how to influence the medical world with their version of treatment, has been very substantial and comes from the maintenance of a large, large medical library. The cost of researching, producing and distributing some of their historical "medical information" in the form of hefty volumes and visual media would be large.
I do not think that the cost is 'negligible'. Far from it. Far, far from it.