The first thing you should know about seeing dead people is that it isn’t as cool as it sounds. At first you think it’s pretty great. I mean c’mon… you can see dead people. And everyone else you know? Can’t. So only you can help them finish out their business and move on to the Great Beyond, or wherever it is they go. (No one’s ever come back to confirm what’s out there, so Mike’s just going on his instincts, here.) It’s kinda like being a superhero, only without having to wear a cape. (Which, according to Donna, are so last season.) And there’s a sense of accomplishment Mike feels, too. He likes helping people.
But ghosts don’t exactly keep bank hours, so they think it’s fun to wake you up in the middle of the night and demand your help, since you’re the only one who can hear them. And that means a lot of late nights and early mornings and really crappy sleep patterns. Plus, Mike can never watch The Sixth Sense or Ghost or that TV show with Jennifer Love Hewitt without getting irritated by how wrong they get everything. And the friends who know what you can do never tire of repeating “I see dead people” as many times as they can in every single conversation you have with them.
Also, people tend to think you’re batshit crazy.
So there’s that.