(Basically, 90+% of the time, it’s a housing agency that will rent out your house pretending to be a USCD parent, but then end up subletting each of yourbedrooms to incoming UCSD students from overseas for $1800/month per room, without telling you….every single time..)

If that’s the case, shouldn’t you just undercut the agency and lease bedrooms directly at $1500/mo? I’d imagine that there are online forums where there’s a market for such things.