There's one reason: he doesn't want to!
You keep mentioning map - I've never even looked at a map here. I read the listings. I'm not sure I'd want people who can't get the data from a list (those same people who want a map online, can't/won't use a printed map). And I don't know if there is a conflict like you describe. I checked and the location doesn't have to be your house (nearby intersection or convenience store or park or post office, etc. will do as long as it's relatively close). If there's a better way, where people will find it, I'm open to hearing about it. I don't use typical social media, and don't have email or phone #s for neighbors yet. The only early contacts I'd want to make would be people who have radios and are looking for ways to use them. such as searching for repeaters.
My feeling on all this GMRS repeater craze is that repeaters, and distance, are getting too much emphasis for this service. It's more useful to me to have nearby contacts. I have HAM for longer range repeater contacts. GMRS, to me, is for people closer who aren't hams, including FRS users (adults). Throw in the rule (for now) that GMRS base stations aren't allowed to use repeaters and most of the repeater craze evaporates. Also, of the ones near me 5 have gone away (no big loss since I can't talk from home). If more people would just try putting up a decent antenna on a pole or roof (15-20ft up), there would be less fuss about repeaters.