I was quoted $7500 for a dual zone unit. 

If you can find dual income tenants that’s better because you will have a better chance of rent being paid every month. 

Well,  you are kinda buying with an agent, it's called dual agency. 

Everyone has their own approach, here's mine:- If I'm purchasing a property that's being represented by a Listing Agent: (a) I get that LA to represent me so they earn the buyside commission as well and are incentivized to fight harder for my offer, or (b) if the LA does not want to dual represent (a rarity) we waive the buyside commission and give it back to the seller, which closes the ask/offer gap.- When we sell a property I represent the Partnership as the LA, but only charge a 1.00% fee - the vast majority of which is marketing (spent on mailers, website collateral, etc), and admin costs.

Can a real estate agent represent both seller/buyer in a wholesale transaction, allowing them to collect both sides of the commission?

Intermediary is allowed in Texas but dual agency is not.

If "C" were to stop paying rent (while in the midst of the eviction process) there isn't another part of this lumped portion of your invested (and borrowed)funds generating income (with the exclusion from other investments obviously, just breaking this question and specific question apart)This leaves you in a bit of a quandary however as your renter quality at $700/mo and the other at $1200/mo could be different and you could also end up with a worse case situation than outlined (having dual evictions going vs one solid renter) -Giving the full argument for both sides/possible outcomes-Having said that I assume, based on your description, that the combined tax assessment of both "A" & "B" parcels plus combined structure assessments, are similar or equal to that of singleton "C"- if not you could face a higher property tax payment on two properties vs. one. 

Well, my biggest gripe with wholesalers is lack of disclosure and you're already trying to get around that with a dual escrow.Isn't honesty to all parties one of the NAR ethics?

So it serves a dual purpose.

I received my undergrad in Molecular and Cellular Biology and I'm currently deciding on med schools for a dual MD/MBA degree.