I think only badges should be given for editing and not points? So, why are points given for editing? Many users make points by just editing.
From the main meta (emphasize is mine):
To promote good edits, a user who suggests an edit to someone else’s post will get +2 reputation points when that edit suggestion is approved. You do not get the reputation bonus if the edit is automatically approved, whether this is because you are editing your own post, you are editing a community wiki post, or you have at least 2000 reputation and all of your edits are auto-approved. Also, you are limited to a maximum of 1000 reputation points earned from edits.
I think this answer is also worth mentioning (emphasize is mine):
[...] You can get up to 1000 as an encouragement to get familiar with the edit system and so that you will get in the habit of doing it, but you won't get rep forever for the work.. It's more of a one time thing (or 500 times thing in this case).