But they are allowed to protect their children, to keep higher standards they feel Hashem wants them to have.
Sof Kol Sof, they can have “other standards”. Until you prove to me that the RBSO wants them to act as they do (and not the rest of us for some reason, as He didn’t tell us to do so in His Torah or via His Chazal), they are not “higher” standards. They are not “more Torahdike”. They are “Kollel” or “learning Torah full time”, and Kol HaKavod to them if that is what they believe the RBSO wants from them.
Now if you want to discuss ease or difficulty of Kollel vs. working, we can discuss elsewhere. My Moshgiach always said Kollel has easier Olam HaZeh.