If you really knew how many guys and gals like you "want to build" relationships to have the agent run comps and show properties....and then never see them again, OR close a deal.
Today is not the "good old days". If you are a professional, you understand the cost to do business. I'm not saying comp an agent on everything he does...but offer a retainer. If the agent accepts it, I doubt they will in the beginning if you are serious and do what they ask of you. You'll write it off as a cost of business anyway.
What a good agent will want to know, DO YOU HAVE FINANCING...if you don't, then follow their lead to the best investor friendly lender with multiple programs you can qualify for. DO YOU HAVE THE NEEDED FUNDS TO WRITE AN OFFER WITH EARNEST MONEY & THE FUNDS TO CLOSE ...pretty simple. If you can provide those, ANY FULL-TIME AGENT will work for you tiresly.
Good trustworthy knowledgable agents are a lot easier to find then actual ready, willing, and able buyers/investors.
Good luck.
p.s.There are some GREAT investor friendly loans that offer investors 15% down AND they will finance and oversee the rehab....with NO PAYMENTS DUE until turn-key.