This WAS true
Until last week.
Space time battle(lv 70+) --> strongest ninja(upper right) --> Redeem(also upper right)
you can exchange those scrolls, along other things, for pts which then you can exchange for items.
The value aren't great but that's not exactly what you are asking for.

Now, some useless item, like medium thread (for some) cannot be exchanged for pts YET, but I think it would probably make it in there eventually as opposed to have a separate system to do whatever.