My cost per verified buyer is 62 dollars from a standing start

Your 62 dollars per buyer isn't the number to compare against 47 cents. Compare the 74 verified buyers to whatever the bought list yields after you make the same calls, because you'll still have to make them. The 1,900 buys you phone numbers you have not qualified, and you already know your reach rate on cold numbers is about a third.

Your two cost figures measure different things. The 62 dollars covers identification, contact, and qualification. The 47 cents covers identification only, and self-identified means the qualification step was never performed by anyone. To compare them, run the bought list through your existing process and count how many survive to a stated buy box with a funding source. If your reach rate holds near a third and your conversation-to-verified rate holds near 40 percent, 4,000 names produce roughly 500 conversations and maybe 200 verified buyers, at the cost of the same calling labor you're paying for now. The 1,900 mostly buys you an inventory of dialing work, and the marginal value depends on whether your VA capacity is the binding constraint or your own qualification time is.

The non-disclosure counties are a structural issue rather than a data-cleaning one. Roughly a dozen states do not make sale prices public, and in those places you build a buyer profile from deed frequency, mortgage absence, mailing address patterns and the buyer's own statements instead. Repeat cash grantee activity over 24 months is a reasonable proxy for a working buyer even without price, and you can ask the buyer directly what they last paid.

On contact practice, calling and emailing purchased lists is regulated, and the rules on prerecorded messages, text, and do-not-call scrubbing differ by state and by channel. Confirm what applies to your outreach with counsel before you dial a list you did not build. That constraint often decides this question for people.

One thing worth measuring now: how much of your closed volume the top five of your 74 absorb. Concentration there matters more to your service than list size.

I like that you tracked conversation to verified at 188 to 74. Most people never log the middle step, so they can't tell whether a bad month came from reach or from qualification. Keep that ratio going even after the list gets big, because it's the only early warning you'll get when a market shifts and your buyers stop being buyers.