They could either not have an edit feature or have a past history archival feature.

With great power comes great responsibility.

"He used the edit feature." VS "He typed something I didn't think he should have."

Just using the edit feature is not the problem, and the first few ninja edits are excusable. It's more like "He used the edit feature in an attempt to trick the people and getting him more upvotes" (as you did here) that I would guess people have an issue with, and as such it's probably counterproductive to your stated goal of gaining XP as quickly as possible. If you want to do that, just be helpful and post fact-checked answers to questions!