Well, you're correct for sure. Considering they're all discretionary "toys" for most of us (unless you're a pro, in which case you'll probably be spending a lot more for an Inspire or something), an extra $500 or so isn't too bad.
The Mavic is night and day compared to the P3S. Don't get me wrong, my Standard got me some great shots and was a good intro, but the Mavic will be my goto for a while now. Easy to take on hikes/trips, cheaper batteries, better controller.