Why would anyone pay thousands of dollars for list of phone numbers, when scammers could use an auto-dialer that cost less than $200, and dial every number in existence?
You theory is full of holes.
On cellphone, I received a call from this number 20 minutes after getting a call from 216-487-7014 (Independence, OH). Let both calls go to voicemail. No message was left. I think they are phishing for active numbers to scam/harass.