On several occasions I have found that in the Suggested Edits review queue there are new (low-reputation) users who almost always suggest insignificant or irrelevant changes to questions or answers. Who are these users?
The Suggested Edits review queue contains edits that are suggested by members that have not reached 2,000 reputation. This limit is when the Edit questions and answers privilege kick in. Until that point, users could gain reputation (+2) from suggesting an edit that is eventually approved. This reputation gain (up to +1,000 reputation per user) could encourage new users trying to improve the site, but might be frivolous (hence being put up for review).