There are two simple methods that I use to kinda keep the PP flowing. they aren't get rich schemes and they come and go in sales. But patience can net you an easy 2 to 3 k a day for doing very little of nothing.
First way, make Celestial Essences they require no skill and are no fail. just takes a little time to make. I sell them for 5pp each and sell 10 stacks at a time, 1k there, minus cost to make, of about 36pp per stack.
Second is to hunt Lesser Shades in Shadeweaver's thicket for their Swirling Shadows that sell anywhere from 40 to 50 pp each. the Lesser Sahdes are level 3 to 7. Easy kills with some very nice PP turn over.
Keep in mind, these won't make you rich over night, but with patience and perseverence you can make 1 to 3 k per day. Of course you wont get much XPing done, but if PP is your mission then these are 2 ways I have found that can turn a few PP up.
You also will find those people who say I am wrong etc. I believe these are the people who wish to keep this market as low key as possible. /shrug So try it yourself and see how it goes on your server.
Note the lesser shades Are on the side of the mountain closes to the POk book at the top of zone at the end of the path Look around the hills and rocks also the drop rate seems to be about 1 outa 5 drop a swirling shadow
Good luck!