Everyone has their own motive for stacking, hoarding, etc.  My objective from day one was simply to accumulate a lot of copper cents just from the numismatic standpoint of the copper composition.  Just like they don't make steel cents anymore, they don't make copper cents either.  So around 1984, I start sorting rolls,  and have continued off and on since then. Last year I really picked up steam, but was  only getting a 20% yield. I new that I'd never accumulate what I wanted at that rate. I have 7 kids (mostly grown and 3 married), and I wanted to leave a  large amount of these to them when I kick the bucket.  I believe one day these will be fairly valuable, I'm just not expecting it in my lifetime.  Once I realized that I'd never get to my goal by myself, I started buying them from members here and on other sites.  I'm pretty much where I want to be- I'll continue to pick up some here and there.
All that being said- I still enjoy the hobby of hand sorting.  Extremely relaxing at the end of  the day, and who knows- may find an interesting piece.  Once  I begin to feel the pressure of trying to get thru X amount of boxes in Y amount of time, it becomes work for me- then I back off for a day or two.  So in my opinion (not worth a lot), unless one is dedicated to putting in a good bit of time and effort, I don't see a huge return on these anytime in the near future.( Hey- I hope I'm wrong!)  

     But in the meantime, I'll just have fun sorting a few, and buying a few!