I have never used Rentcast and do not know how accurate it is.  

If you don't accurately budget for these phantom expenses, you could be thinking your getting a cash flowing asset but in reality, you are getting a property that cost you money each month due to  these unaccounted for phantom expenses. 

@Daniel BaradRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

If said agent performs and double dipping (i.e Duel agency) is legal in his/her state, shouldn't they be compensated for there efforts?

Her rent will be going up soon.Try your best to see the glass half full and find an opportunity to make your asset better performing.

But remember, every dollar you pay the syndicator to do their job (which is find deals) is a dollar of extra performance you need to get to make up for the fees.  

The performance of your particular asset... real estate markets... lending markets... interest rates... general economy... 

As you over perform for your investment partners, the well will get deeper and wider. 

Assuming the data is accurate, it could give you a leg up, but the counter is that prices in those areas are higher.  

@V.G Jason 40% of the agents in the whole industry is active, only 20% of the agents closed deals in the last 3 months. 0.005% is an accurate figure for builder agents