As someone who ran large buyer groups on here for a couple of years under another name- it's important to do your research before paying money to any of these services. Almost everyone of these guys loses for the season, and you just can't rely on their posted results year to year. They can say and do anything they want, as they are not regulated by anyone. The best advice, and the only advice I'll give is to make sure they use an INDEPENDENT service monitor, who will post the actual unbiased records. Check here for actual records of many of these services mentioned above:
https://www.thesportsmonitor.com/pages/handicappers.php
And further, places like WagerTalk, Pregame, Covers, etc, etc have another angle. They don't post true records- they just hunt for specific circumstances with good records- and post these instead. Here is a perfect example: An overall record for one of the guys in baseball might be 112-132 for the season BUT they will post this- "10-3 last 2 weeks on visiting teams facing a left handed pitcher in night games"........ don't be a goober, use some common sense when spending your hard earned money!