How did YOU buy your first 10 rentals?
First, how many rentals do you currently own?
Second, how did you acquire each of your first 10 rentals?
Third, how long did it take you to get your first 10?
You don't have to give a blow-by-blow account, but maybe a broad overview like first 4 were conforming mortgages, second 2 were sub2 deals, next 3 were bought using a line of credit against the first 4..etc.