Bear, I think that a lot of bowl blanks are sealed with wax.
The benefit of Anchor Seal is that it has a low evaporation point, and will typically evaporate from the wood during the sterilization process at the end of the kiln cycle (135 degrees F), which leaves no residue to accumulate on your power tools. Wax won't do that.
In 5 gallon batches, Anchor seal is around 15 bucks a gallon.