In fact, if someone ran a contest - $100,000 prize - most production for the month wins but you could only use one marketing method I would choose B to B - and I'd smoke everyone.
Go pick any other system you want - buy all the leads you want. You won't touch my B to B production at month's end.
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Ok, i'll play in your little contest.... my method will be... roll all 550 of my clients to another carrier.... I WIN.... now pay me my 100 grand...lol