The way agents here seem to feel isn't an accurate example of how the majority of lead buyers do.
Many of the agents here have been there, done that, with lead companies. Every major (and some minor) lead vendor has been raked over the coals on this forum . . . often justified.
And almost everyone has at least 1 "hero" story.
Most of the agents here who have bought leads, or still buy them, are experienced. They know what to expect and how to work a lead.
But we still get our share of rookies on the forum that have been told by their manager to (1) make a list of 300 people you know and then after you have burned through that list, (2) buy internet leads.
If not for rookies the lead vendors would either have to retool their business model or go out of business.