If you're serious enough to let someone take a chunk of your income to "help" you with your channel, then you should be serious enough to do a little bit of your own legwork and start researching FREE resources that will get you much better success.
Even here alone on yttalk, you'll learn much more and be more capable in growing your channel than an MCN. You can also check out videos from video creators and derral eves for getting down the basics.
Ultimately, your success is dictated solely on the quality of your content (with a sprinkle of luck).