In the long run, I will earn a higher return as I can use the same cash several times over as I turn over fix and flip property.

if the average earnings of a realtor is about $30000  per year don't see how a third own investment property, unless they are counting primary residence.

I also agree that you need to be finding ways of chasing projects that brokers aren't currently doing to identify good projects for your hard-earned cash.  

IMO for or someone like @Michael Blitshtein overseas this is a much more reasonable method to deploy his available 30 K across  5 or 6 diverse investments and reduce his risk and management headache vastly as compared to one 30K D grade property.

That's an issue with outdoor advertising - you have no filters on who might call you, whereas with search they are using specific keywords and with direct mail we mail to specific people.Signs produce the lowest cost per call, but also the lowest quality calls.But also - if they were confused about your message, reduce the # of words to only what is needed ~ "WE PAY CASH FOR HOUSES - 888-999-7777".

Average home prices in your area will also reflect your potential earnings as well as the agreement with your broker for your compensation % of commissions.

Considering the fact that it is already occupied and earning $2200 a month, my only other question that you didn't mention in your post is:- are you taking out a loan? 

Just remember that wholesaling and flipping are active income, which means time spent for dollars earned.

They might be a great avenue for you to learn from (while earning from)!  

Although an increase in rate will slightly decrease the affordability of homes and reduce the potential cash flow of levered investment properties it will be positive for the overall economy and especially the banks.