As long as you dont have Edo hashi, seal scrolls have value. And before you collect enough to recruit him, you get all ninjas from smaller treasures with free draws (420days +-) - except maybe 1 tendo treasure rare which by that point you should be close to having, and kage super rare/itachi ssn. At that point you might want to recruit edo itachi since you should have like half of the frags already- if not then just hoard and wait for future updates.

I can totally relate in general. My next upgrade from treasures is mentioned edo hashi and when i do rebates i dont even look at what i get, just 30x10 and esc to make it faster :(