Evaluate my STR performance via a PM - should I self manage?

[Alan Ford]

Hello - I have two STRs in the Pigeon Forge/Gatlingburg area. I have had one for two years and the second I purchased this year. The first one is a 4bd/4bath log home and it is with a well know local property manager. They take 30%. However the property is grossing 70k+ every year and it did that for two years prior to when I purchased. My mortgage payment on it is 1,900 a month. My PM tells me that in that area those results are simply not possible for a “do it yourself approach” is this true? The second property will do about 45k a year for a 2bd/2ba and the same PM. That mortgage payment is 965 a month. 

Thank you for any insights!