Turnkey companies. What's the motive?

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I'm about to start REI and am looking at out of state turnkey companies since California is way too expensive. My question is, why would a turnkey company sell a property that's making money instead of keeping it on their books and collecting rent? I don't get the motivation. One company I'm looking at is selling properties with renters in place and offers property management afterwards. Why would they sell this? Thanks!