I estimate that there have been thousands, if not millions, of successful rentals based upon my own experience and reading these boards for a few years.
Not being critical but more trying to be educational, while it's fun to throw out guesses, suggesting there have been millions of rentals is kind of pushing it.
If we estimate that in a year DVC will have about 2500 villas available for reservatiions, and the average stay is 5-nights, then that will be 182,000 total reservations available in all of DVC for a full year. If we say as much as 5% of these will be rentals, then that will be up to 9000 rentals in all of DVC for a year. And that's AFTER all the new resorts open up. At that rate it would take 111 years to get to 1 million rentals.
If we look at past history, OKW is the oldest resort and has 531 units and has been open 15 years. If we use the above numbers (5% rentals, 5-nights stays) then OKW has had maybe 2000 rentals/year, or a total of 30,000 rentals so far. The other resorts are smaller, or much newer so their totals would be far less. Examples: VWL has 136 units and opened about 8 years. BCV 208 units and open for 6 years, BWV 383 units and open for 12 years. SSR full resort only open for the last couple of years, and a very small portion of AKV currently open at all.
Put another way, if an average rental was 5-nights, then 1-million rentals would be 5 million nights. That's 13,700 years worth of nights.
A million is a big number...
I guess it's hearing politicians throw out huge numbers like this all the time makes us think they aren't as big as they really are.