Owners with only one property?

[Roy Gottesdiener]

I heard on the biggerpockets podcast they mentioned a statistic that only a really low amount of people who buy a property end up with just the one, meaning the hardest part is to get started but then you easily get into the next deals.

Does anyone know the exact number of what percentage of people who get into real estate end up with more than one property and where can I see the source?

Thanks!