finding positive income rental units

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when a house is advertised and the math is done and there is a positive income to be made...are these deals too good to be true?

i mean, why would someone want to unload a money making property they advertise as having many new things added (i.e roof, furnace, converted to triplex) if its making positive cash?

what are your experiences as far as these sorts of deals....does one buy them up only to discover they make no money at all?