The "buy a rental every year strategy" - is it a good one?

[Kevin C.]

Can anyone share thoughts or experiences on buying one rental every year strategy? On paper it looks like I could essentially replace my income when I get to two dozen rentals cash flowing a few hundred dollars a month. Is this a good strategy for a part time investor? Has anyone done this? Did you stick with it? If this is not a good plan, what would you suggest instead?