The PTO only costs about $250, but the generator accessories look pretty pricy, and the obvious winch example...is there a superior option from Warn or others to the mass produced electric winches? I bet there is an air conditioning unit somewhere, but would that be your first choice? In other words, there are many things you could attach to a PTO, but what would you actually use vs more common and/or cheaper options. What is the compelling application? Otherwise it is a waste of money. My guess is a snowplow or some other common specialty is the compelling application.
In addition to the obvios winch, PTO could run a snowplow down pressure unit, a set of leveling jacks, any number of tools off the rear bumper, augers, tilt beds, steering assist, etc... They are really work truck options, but also something you can use to be much more awesome than the other guy. If I was dropping all the coin on a new truck, I would probably get the PTO if I knew it was available.
I would want to know exactly what you get in the PTO option though. If it is just an installation port on the transfer case, it might not be worth the money. If it a clutched, driven shaft, it is probably worth it, even if you never use it!
On the Fords the PTO option includes the port on the trans with the internal gear in the trans to drive it. I believe it also includes the software programming in the PCM for a PTO. There are all sorts of commercial uses for a PTO; wreckers, bucket trucks, etc. I'm a fleet mechanic and deal with them alot.
Don't know if the upfitter switches are an option or standard but make sure you get them. They are the factory row of switches that are fused and relayed power where the factory breakout harness is in the left rear corner of the engine compartment. Make adding lights and such very easy.