One of the coolest things about this site, IMO, is that we can have discussions like this. And the services forum is in no way the best part of this site. But I'm sure damn near everyone knows that, so I'm preaching to the choir.
I agree with Jack and pretty much everyone else when I say that the vast majority of these guys are snake oil salesmen. They're trying to separate guys from their money, pure and simple. They do that with their 'GOY,' 'Crush your man,' 'Titanium,' 'Plutonium,' 'Your wife is going to cheat on you with the cashier at Piggly Wiggly if you don't buy this play' plays. Ok, so I made the last one up. But yeah, those guys are bastards and that's all marketing B.S.
Full disclosure... I started betting on sports about 10 years ago. As bad as I am now, I was even worse then. I know, that's pretty frigging hard to believe, but it's true. Anyway, I learned the hard way that these guys will cost you money in the long run. However, in the process of finding this out, I did find ONE guy who does pretty well, year in and year out, and documents his record every week, every year, etc., for the whole world to see. He doesn't market or hype his picks, he just releases his picks every week and, usually, he does pretty well. He doesn't hype his picks because he has a very big following due to his years of success.
I don't blindly play this guy's picks, but if I see that he is on the same side it does give me a little more confidence. And there have been times when I've stayed away from a side because I see that he's on the other end. And mostly, I've saved myself money by doing that.
Anyway, that's my novel. While the vast majority of services are shite, you can actually find decent ones. At least that's been my experience.