Being really honest: yes, I probably get more than $5 of value a day. That is less than I make in 10 minutes, I use my phone most of the time I'm off of my work desk, I use it to read my books, watch stuff online (even while home), to research basic subjects, etc.

So even with that price I'd consider it more valuable than what I'm spending.

With that said, of course I can have a very similar experience while using a cheaper phone so a better ROI but I think that phones are actually our most bang-for-the-buck gadget nowadays.