I'll give these ?'s a shot:
Very true... I often find myself staring at my collection for hours on end trying to learn the behaviors of each frog...
I don't find it terribly difficult to care for them... Setting up the right environment does take time and a bit of research though... You'll want to figure out what species you'd like to keep first then build their enclosure to suit their specific needs. Depending on the frog and amount of that species you choose, you can have a vivarium as small as 10 gallons on up... For example, Dendrobates tinctorius are some of the largest dendrobatids but a pair can be kept successfully in a 10 gallon if set up properly.
Most of this answered above however, I wouldn't recommend PDFs if they are going to be moved around a lot... This can be very stressful and can have negative effects on the health & well being of your frog/s. how often are you going to be moving their enclosure?
I'd recommend starting off with froglets so you can learn all aspects of a frog's life cycle before trying to breed...
That's going to be your call... If you can successfully take care of them and not harm them with constantly relocating them.
I haven't worked with auratus but can tell you from experience that d. tinctorius have an almost silent call... Also, with almost all PDF species, females do not call.
Ask away!
-Christian