Paying for donbest.com......

Paying for donbest.com...... Is there any reason, other than having real time odds, that someone would pay for the donbest service? My betting is primarily with a local, and he pays for the donbest service, so any advantage i would gain would be negated. am i correct in that assumption?
The local is smart cause he can see plays hit the screen and get a chance to move his line before he is hit..imo this is stupid cause a book should move on bets and there own volume but its not a reality. To counter this some of the bigger groups bet the screen books one way and then unload local books the other way of games. If u are betting with a local it is prob not much use for the investment. If you have 20 outs and most of the screen books on credit then it is very useful as a one glimpse feed to see exact lines everywhere. The free sports options here is pretty good actually. Yes it is delayed but it gives a good indication of movement and a snapshot of odds. I don't know an exact dollar amount but if you are not betting atleast 1k+ per game prob slightly more its prob not worth the money..if you are a large bettor 5k+ a game, a scalper with a lot of outs, then it is a must but there are several options of these line services. I prefer sports options personally but I hear others like donbest. Hope this answered a little bit of your question. Good luck