As soon as you have proven with a few minor categories that you can edit and seem to be honest, you are left alone! There is a tremendous lack of editors, and once you have proven that you can do it, you get more responsibility and more work as you may probably wish for!
If somebody HAS a hidden agenda, he/she can go undetected for a very long time, if he/she is not too dumb. Fortunately enough, those with sabotaging schemes in mind seem either to be dumb or too shortlived. However with the track record I have gathered so far, I would be able to start some serious trouble which would go unnoticed for quite a long time. But the amount of time and effort I have invested so far to get this track record would (hopefully) make no sense for anyone with only mischief in mind.
Basically all true, but the "work" is self-imposed, not forced. You can ignore all the submissions if you choose, or you can obsess and try to handle all of them all the time.
As for you being "able to start some serious trouble" -- can't we all? You've proven yourself trustworthy, apparently, and the assumption is that you'll continue to be. If it's found otherwise, then you'll be an ex-editor in fairly short order.
Ultracomplex, sneaky schemes are possible, yes, but to _start_ by thinking that something like that is the reason for not getting a listing is silly. It should be the last thing on a list of possibilities, not the first.