I think I'm a Drow now
QB was at least partially right, in that hunting familiars is sub-optimal in the sense of expending energy for no 'income', as only a full-on witch always drops a grief seed. Grief Seeds don't have to be used then and there (as shown by the various attempts to give them to Sayaka). A magical girl with larger territory that takes the time to hunt down witches is going to end up with a decent sized pile of grief seeds, letting her fight nastier witches with less danger, due to more recharging and so more use of powerful techniques (remember, Mami had 'bonus magic efficency' as her thing, so being able to dump out 'giant blasty attack of doom' more often is actually useful). Actually attempting to farm witches is going to be hard due to both morality and them being good at hiding, and any witch is nasty enough to potentially kill you, but spending a lot of time and energy on familiars can legimately be argued as not very useful.No need to be rude.
Alright, even if she can't really do that, she still intentionally interfered to let the familiar go, which will still have predictable results.
Also, was it stated somewhere that Grief Seeds can't be stored for later use, or just implied? I can't remember.