I have been VERY successful at doing that (as have others I've spoken with), and I attribute this to doing the things I mention above.

The design is very important to stand out from the competing listings .

You need to stand out in the crowd to be successful.

I think it has some positive attributes but pricing seems to be a bit all over the place when I look at other listings.

I also invest from 1500 miles away from my market and self manage. look for ways to add value to your product and you will stand out and get a little more for your rental unit. 

Here are some additional methods to help you find off-market deals:Networking: Make connections with other investors, real estate professionals, and possible sellers by going to regional real estate meetings, networking events, and industry conferences.Direct Mail Campaigns: To connect with homeowners in certain neighborhoods or with particular property attributes, create a tailored direct mail campaign.Driving for Dollars: Identify foreclosed or distressed properties by physically driving or strolling around neighborhoods.

Also, the higher costs are also attributable to a lifelong benefit over that of a temporary (20-30 year term). 

We get lucky sometimes in our investments and then we forget that and attribute it to our own skillfulness.  

(Tiny A frames properly designed can kill it.)In an ideal world, you're combing more than one of the above to stand out in an increasingly professionalized industry.

Most STR markets are really crowded so it takes thoughtful design to make your property stand out.