Good insight Jonathan. As a short-term rental owner in this area for 15 years there's a couple of additional points I think anyone reading this would want to know.
Location - I have found that if your property has great photos and a very well-written description of its proximity to the beach, potential renters have more trust and book with you over a listing that just says "beach view". Guests want to know exactly what they are getting. We often host families from the midwest and upper midwest and that's a long drive to not be sure of exactly what you've rented. Over time, guests will leave reviews confirming your description and this will further your credibility and trust. All that just to say, don't think non-beach view properties are dogs. We get $1350 wk. for a 2/2 in peak season for 1st tier.
Taxes - Save yourself some headaches. Pay for a service like Avalara to file your taxes. The State of South Carolina is a nightmare to deal with on your own trying to stay compliant. We let Airbnb pay our state tax and the Avalara takes care of the rest in local, hospitality and whatever SPLOST taxes they dream up.
Rental management - I have a strong opinion that you should not use an on-site or off-site rental management company. Keep in mind that Myrtle Beach is a big destination for Bike Week (Spring and Fall), Youth sporting tournaments year round, golf and conventioneers. Not to mention regular beach partiers. These rental management companies will treat your property like a hotel and rent without discernment. We switched to doing it ourselves with HomeAway and then 3 years ago switched to Airbnb. We made a lot more money and had a lot fewer headaches and damages. Find yourself a good local housekeeper, treat them well with the occasional bonus and they will be your eyes and ears. Airbnb makes it too easy and I enjoy meeting the people.
The trick is to develop a process and stick to it. Continually improve it to gain efficiencies and free up your time. I bet I spend less than 10 minutes on every rental and we consistently rent 200 days a year.
Rental history - Unlike long-term rental cash flow, the history of a vacation property is not always translatable to how successful you will be with the property. Remember that a lot of revenue is built on relationships with return renters and web sites like Airbnb where you build a reputation. When you purchase a property, those benefits don't necessarily come with it. You may be starting from ground zero to fill your rental calendar.
Sorry to hijack your post. Hopefully my added comments will help potential owners in the post-purchase phase to be successful and buy more properties. I know we plan to so I'll reach out to you @Jonathan Edmund when we get ready to buy again.