Turnkey properties, what happens after the first year?

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I'll try to not be generic and over-generalize, but I keep seeing websites and offers for investing into turnkey managed properties who rent out the properties, where during the first year you're promised 10% to 15% ROI's. When I see this "first year" nonsense, it sounds to me like a ponzi scheme, but I want to know what happens after the first year..because no one in the right mind cares about how this starts, we care about how it finishes. So I'm looking for someone nice enough to tell me what happens after the first year, after the "everything is peaches" period, and preferably someone who invested with companies like this before and remained invested for more than a year.