I got this topic off another site and I answered it on that site. I gave a short answer though. Do witches help mere mortals. First are we not mortals. Secondly we do help. There are times we are helping and you don’t realise that we are doing anything.
As for doing spell work, we do it to help you. Of course there is a fee. Not every person who calls themselves a witch is a witch mind you. The term is thrown around so frequently that you really have to sift through the real from the fake. Just like looking for an MD.
Now the dilemma is this. We help you and you turn around and do something to sabotage the work. Then you say that person is a fraud. We are helping you. The strength of the spell does depend on the practitioner and the client.
The God/Goddess know when to intervene. They always have and they always will.
So do they help. Yes! Will it work depends.
Hope this helps. Please comment if you have a different view or same that you can add to this.