Don't get hung up on $$$ compensation. Hobbyist exemption only covers fun flights. If you use the drone for any other purpose, you are no longer exempt and are considered "commercial".
Flying for fun, taking pics and vids to share with friends and family is all exempt.
Flying your drone out in the field to see where your cattle are is commercial use. Likewise for checking storm damage on your roof. Taking real estate pics, even if it your own home, is commercial.
All these are commercial because they are done with a purpose other than recreation.
All that being said, once you get your 107 cert, you can still fly as a hobbyist (if it is just for fun).
Another note: hobbyists CAN sell their phots/videos without a part 107 certification, as long as those photos/vids were taken during a recreational flight with no intent of selling them. Make sense?
For instance, filming your pond, and all the sudden Nessie pops up. Yup, you can sell that. Also, if you post a beautiful picture, and someone contacts you and asks about buying it. Yup, you can sell that too.