- giving up call privacy,
- giving up some audio fidelity and
- talking like a jackass into an upturned cell phone
Furthermore, Because this communication is always half-duplex (one person talks at a time), not only are you able to communicate less information in the same time frame, you're going to use exactly HALF of the bandwidth that you would with a regular call of the same length, even more so when you consider the time spent waiting for a chirp in response. You're actually SAVING your provider money, and you're paying for the privilege. WHY WOULD YOU DO THAT? It doesn't look cool, It isn't convenient, and it certainly isn't saving you any money. PTT sucks. end of story.