In My Humble Opinion (YMMV)
I am in MLM (SendOutCards) and am amused by the phone calls that come in, since they've "found" me on the internet. Seems every time Todd Falcone has a new training on "recruiting existing MLM'ers" or on auto-dialing systems, the phone calls increase.
In fact, I programmed my Caller ID for one out-of-state number "Prob Spam Aug 18" and he/she calls every 2 days, and I just click on "send to voicemail", whiere they never leave a message. Wow. It's kinda fun.
I used to call purchased leads, and the problem is either the people have no clue of how good MLM can be (and it CAN be), or else they have just invested $300 or $700 or whatever into their existing program and have no interest or inclination in trying a new one right now.
YMMV (your mileage may vary)