Ask for the deliverable count in writing before you approve it. A $150 drone add-on in most markets means something like 5 to 10 edited aerial stills, and sometimes a short clip of 20 to 60 seconds. Some operators include a video, plenty don't, and the word "aerials" on a quote doesn't settle it. Get the number of images and whether video is included, and ask to see aerials they've shot on a lot the size of yours rather than on an estate.
The fee also covers something you can't buy separately. Flying a drone for a paid job requires an FAA remote pilot certificate under the rule known as Part 107, so part of what you're paying for is a pilot who's allowed to charge for the flight and carries insurance on it. Your airport four miles away is exactly why that matters. Controlled airspace around airports requires authorization before flying, and a certified pilot requests it through the FAA's system, often getting an answer in minutes, sometimes not at all for a particular spot. If the shoot can't be authorized, you want the quote to say what happens to the $150.
On whether it's worth it here, the acreage rule of thumb misses your case. The park is the argument. One frame from 80 feet showing your back fence line against open green space communicates that better than any ground photo, and buyers scrolling on a phone see it in the first three images. That's a different reason to buy aerials than showing off 40 acres. Rules on flying over neighboring property and people vary by state and by local ordinance, so let the pilot handle where he launches from.