Probably because it will be shuffled away to the bottom of the in-tray if done through proper channels.
This is one of those scenarios where I struggle to support anyone tbh. The Lions are perpetuating a non-inclusive and narrow set of rugby solely on grounds of money. Sensible perhaps, but I struggle to cheerlead for it, particularly with the Lions who are one of the last great romances. And normally I'm happy with a pragmatic stance on Tier 1 attitudes to Tier 2. It's nice to see someone calling them out. Just not when the guy is Nigel Farage's long lost angrier Samoan cousin. Or maybe Russel Brand's. Whatever.
Mindyou, there's plenty of growing rugby countries that might legit ask for a touch of the Lions magic. The USA, as was explored. Georgia. Argentina. Japan. They'll all be told no, more or less, because the schedule is too tight and there's an obligation to the hosts first and foremost. There would be a great romance about going to Samoa, one of the great rugby hotbeds of the world, but I don't think they're any more worthy than the others.