That's just part of the improbability principle and the law of large numbers. You only hear about the ones that get turned in. Think of the number of lost wallets that don't get returned. I'm a numbers guy, it's hard to have faith.People hand in found wallets full of money all the time. Have a bit of faith in humanity, I do.
I put sticker on mine with $$REWARD + cell phone. I was thinking $100-200. The battery might be OK after a crash. It's the right thing to do to take responsibility for any damages or injuries. Your mother would want you to put your name on your drone.Two things.
1. A sticker with your contact information costs a few cents and is worth doing even if it only increases the odds of recovery from zero to 1%. I put mine in English and Spanish.
2. If the drone went down hard it will likely be in pieces. Those pieces are worth more to us than a stranger since we will likely then be able to recover our SD cards and flight logs and file for a warranty repair or pay for repairs. Cash in hand as a reward will be worth a lot more to a stranger than trying to pay to fix a broken drone and then buying a $590 controller from a DJI reseller.
So the bottom line is that I'd put some contact info on the drone and hope someone makes the "nice" decision to return your downed drone. Personally I hope to never have to find out whether or not I am being overly optimistic in humanity.
On another note, what do you all think is an appropriate reward to offer for a recovered drone?
It would be nice to have some sort of password lock out, so the MB is useless unless the password is removed.