Sorry for the multiple postings, but at my age brainstorming has slowed down to a drizzle. Probably neither a myth nor bad advice, but a misconception, is that pipe gurgle is the result of saliva somehow working its way into the stem and down to the shank.
Not being a particularly "wet smoker" myself, I always suspected that moisture collected in the shank because it condensed out of the warm smoke stream as it encountered relatively cooler parts of the pipe.
This was confirmed, at least informally, here at PipesMagazine's forums by Iowa Phil, who, with inimitable creativity, used green food color to tag his saliva. He smoked until his pipe developed some gurgle and upon inspection the moisture was not colored green. That may not be high science, but it works for me.
OK, so I'll stop hogging the bandwidth and let someone else put in their 2¢