I think cryptocurrency can replace hand to hand transactions now as well in most fully developed populated areas. You see Cash App and Venmo becoming more popular for buying websites and other sources. Why not use something more secure for these payments too? When I sold my motorcycle I listed that i accepted BTC ETH and LTC. The response was amazing just off of that line of the post - people were interested.

Plus in some communities with specific types of hand to hand transactions I'd love another form of security over my funds. That way people aren't showing up to craigslist meets gripping their pocket full of money so hard their hands turn red