I usually hunt alone for several reasons. First, I work odd shift hours and that doesn't make it easy to go with someone else. They're getting off work at 4pm and waking up bright and early on a Saturday morning, while I'm getting off work at 2am Saturday morning and sleeping until at least 10am. They think "half the day is wasted" and I'm downing coffee just to stay awake. I can also hit a spot for 2-3 hours in the middle of the week before I have to be at work in the late afternoon, and most everyone else is at work already.
Another reason I hunt alone is that I've found it easier to get permission for an area when it's jut me showing up and asking. A lot of times when I've gone with someone else, the person we're trying to get permission from has a much more jittery look to them, you can tell that they're eyeing this "group armed with detectors" and either feel overwhelmed or suspicous. I think a part of that is them thinking "there must be something really good out there for more than one guy to show up looking for it", even if it's just an old ballfield or homesite. It seems they worry more about the digging too, if I'm alone I can demonstrate my recovery technique to convince them that I'm not going to leave gopher holes in their yard, but "what about the other guy?". And how many are going to show up next time? There have been times that I've been able to charm a property owner for permission, and my detecting partner has acted like a jerk by stretching the property boundaries, being careless with recovered trash, using foul language or coming off as not being appreciative of the opportunity. That just spoils it for everybody.
I've also found that there are way too many "quitters" out there, people who buy a machine and don't learn to use it properly. It's an old story, someone buying a detector or getting one as a gift then it ends up in the closet because "it only finds pop tops and nails". Some of the people I work with have good machines, and they can't be bothered to spend a few hours getting to know how to use it. Some don't even read the manual. Invariably, these are the same people that "can't find the time" when I offer to "hook them up" with a few teaching sessions, advice or techniques to be more successful with the machine. I offer to drive, I know where to take them so that they'll find enough coins and doodads to keep them interested, I intend to treat them to lunch, and do everything I can to make it an enjoyable experience but they're just not that into it. They hit their own yard once or twice and all they found was a wad of tin foil, so they're convinced that there's just not much more to it than that. One guy I know got a detector for Christmas a few years ago, didn't have any success with it, then stuck it in his garage. I got him interested in giving it another try, but he'd left the batteries in the machine and.... you guessed it, the now-leaking batteries had destroyed the machine. One thing that all these people have taught ME is not to give it a second thought if I see someone else swinging a detector over an area I'd wanted to search. I've only met one other person doing that who actually knew what he was doing, and he welcomed the "competition". We both did alright, but he lived much further away from that spot than I did and I never saw him again. (It's a different story in my experience when it comes to detecting at a beach, lake or pond. Occasionally there are more people swinging a detector than swimming, and the competition is often not-so-laid-back).
So the end result is that I'm usually on my own. And that's fine, I know where I want to go, how long I want to stay and can be on my own schedule. My mind usually just clears itself after two minutes of swinging the coil and I zone out until a tone signals in the headset. If I'm in open country and there's no other reason not to, I carry a pistol, first couple of rounds loaded with rat shot for snakes and other critters. If I had to worry about the two-legged critters at a certain area I just wouldn't go there because I wouldn't enjoy it anyway.
Steve