They should all be worthless as they don't exist anymore.
There are people out there who want them to exist. for example, alphaBar is pushing his new PTS based DPoS coin.
I most certainly would have dumped every PTS and BTSX I had if i had even an inkling of a clue that I was supposed to. I sure as hell bet you did.
Yes, everyone who held PTS shouldve dumped it immediately after snapshot while the price was high. Basically a couple people managed to do this and they benefitted. But everyone else didnt lose. Everyone else stayed the same in terms of their value. It doesnt hurt you that you didnt happen to be the lucky one.
I personally doubled my BTSX holdings after the price drop, a week ago. I havent sold any and do not plan to until prices rise significantly.
There is no reason to dump BTSX.