Well, I can give you my opinion only, regarding the pps. I see several reasons.
1)Dilution, caused by insufficient other sources of funding, including enough cash from revenues
2)Lack of promotion
3)24/7 Message board bashers for about four years
4)Weak stock market
5)Lack of strong emphasis in U.S. on environmental matters
All that being said, I agree with bobsnook.
Solving just #1 will change the pps picture, IMO.