You can smoke tobacco that is bone dry, and moisture will still occur. The natural biproduct of combustion is H2O. But, mainly what makes a pipe smoke wet is turbulence in the stem. Bent stems, draft holes with spaces to create turbulence, smoking a bent pipe in cold weather can reduce all condensation out of the smoke. But, what makes the gurgles is mostly when the draft hole comes out into the chamber too low or dead bottom, where the droplets of condensation have nowhere to go or to drop to.
It seems that the notion of draft holes being dead bottom is what members here seem to look for in pipes, but these can also make the pipe very frustrating.