I get what you're saying about a lower price with costs for each service but I think I would much rather pay more up front for a reliable device that doesn't require so many trips for servicing. I agree with you though that it'd probably make a bit more sense to charge more on the front end and just include the PFE. They actually would probably be better served to design a PFE that could thread or friction fit a removable cap that appears like the standard mouthpiece so that folks can have the stealth aspect covered while taking advantage of the overall improved performance of the PFE. Hell, why not increase the ability to blend in a little more, have a small tip barely protruding from that friction fit cap so it appears that the pen is clicked out and ready to jot a note. The hollowed out space could even be used to carry a little nug or ground herb. Kinda nice to have 2 bowls instead of 1.