In fact assuming you are only trying to sell one...
You start off with the squeeze page >>>Offer great free content>>>convert a few but then...there are still those who DIDNT buy (and probably never will).
Do you at this point...
A. Continue to offer great free content to them for years and years hoping one day they will buy your product.
B. Start HARD sellign them...until they either unsubscribe or buy.
C. Monetize them, by giving them free stuff in exchange for referrals, adsense clicks or something else?
D. None of the above