For anyone interested, here is a link to the AMA 2018 Insurance Summary: http://www.modelaircraft.org/files/InsuranceSummaryMembers.pdfI think your right.
While I believe the AMA coverage goes beyond occurences at sanctioned events and flying fields, it does not kick in until after your homeowners or other applicable insurance is exhausted. Also, it does not cover commercial operations (paid work) or the drone itself.They do have commercial insurance available through third-party insurance companies.
On an unrelated note, here is the difference between your and you're. These two words sound alike, but mixing up you're vs. your is an embarrassing mistake that is easy to avoid. Your is a possessive adjective and modifies nouns. You're is a contraction of the two words you are.