As has been said, do you need a mod? I have never used one and don't feel I have had any issues. Some moments one might have been useful, but to be honest I would rather members be able to chill. Plus, how well can you really trust someone behind the screen? Releasing control to anyone else in your business should have some degree of trust. By helpful, is he doing things that are genuinely helpful to you, or is he pushing his help on you?
As for whether you should be suspicious, mmm unless he's trying to get something for free (which may be time, attention and freeloading rights), probably not much to worry about, unless he has a power complex and will destroy your room from the inside. I do think generally when you get an amazing amazing regular (or a super helpful one) they have a story which makes them that way with you. Baggage is something which lurks around camsites, and you may never know what it is. It could be nothing sinister, but it also could be. Chances are it won't ever effect you. But members who seem to be the friendliest, chattiest and most dedicated may be this way because they need the escapism more than others, for whatever reason. So if you are feeling suspicious then you may be picking up on something. But IMO so long as they're cool with you and other members, allow them to escape from whatever it is that makes them love being on camsites. If in this case, it is being extra helpful in your room then so long as they're tipping and not causing a disturbance, you probably don't have much to worry about.
If he isn't tipping then he may be trying to get something from you.
