Questions about outsourcing calls/cold calling services

[Mike W.]

I keep getting phone calls from what sounds like call centers, wanting to know if I want to sell my house. I don't but in an effort to educate myself I have said "yes" several times and answered their basic questions. I have NEVER gotten call back inspite of indicating that I was a willing seller in one of the hottest markets in the country.

So, my questions are:

1) Do these companies get leads then sell the leads to whoever will buy them or are they already contracted for a specific buyer?

2) Is this a successful tool/business model for getting leads assuming good mailing lists or do they turn people off like they do me?

3) How do contract callers charge, i.e. per call, per lead, etc

4) How do I go about finding a reputable person/service to cold call for me off of my list?

Thanks for any advice!