How much are peer to peer services being monitored by the governement? What amounts would they go after you for selling?
When you pay cash by mail do they use your return address as part of the KYC?
that would generally be insufficient for KYC. i haven't seen people doing cash by mail in years anyway.
this is all dependent on where you live and do business, but in the USA the lowest MSB reporting threshold is $2000. that means at $2k or above, you should probably be collecting name, address, government ID, taxpayer ID, and date of birth.
https://www.fincen.gov/money-services-business-msb-suspicious-activity-reportingall of the cases i've seen where localbitcoins traders were arrested/charged involved high volume traders dealing in single transactions above $10k without AML/KYC. >$10k requires
mandatory CTR reporting so it's an obvious threshold to be careful of.
https://en.wikipedia.org/wiki/Currency_transaction_report