And the broker can discredit other, more honest brokers by saying those agents who suggest a lower list price just want an easy sale.However, if a Broker gives you a list price that's much higher than other brokers, usually it's a trick.

Wholesaling seems easier in lower priced markets from what I have seen .On the plus side if you actually have a deal it’ll be easier to assign it since there is a lot of investor activity now and it seems everyone wants to be in real estate .

and if so is there a lower limit on the amount of cash flow I should expect on any given property?

Find a partner who can put in the capital or There are private/hard money lender that will let you put 10% down payment and  they will finance 100% rehab cost. keep in mind the rate will be a lot higher and they charge point (2%) but they can close fast and you might be able to negotiate the purchase price even lower. 

I came in with an offer substantially lower, and the sellers took it.

If you are looking at a property in a lower appreciate area of DFW what CoC return would you be looking for at minimu.

Of course, you can just pay cash for construction expenses, but this will need more initial investment and you'll have lower return on your cash. 

If the seller is not in a rush, then it will be hard to lower down the price based only on cash vs mortgage.

So if I got preapproved for a loan right now and I don’t buy a property within 4 months, it will expire and I would have lowered my credit score for nothing?

I think it'll always be one of the lower tier midtown studios, with its market being midtown millennials, who can't afford $1,500 per month not including utilities.By the way units in the same bldg. w/ same sq. footage sold for $99k in Jan.