> It’s a foreign concept for many of us who seek out the best product or deals for each purchase and will change brands in an instant if another company releases a better product.

Perhaps those folks found certain brands regularly have decent (enought) quality and stick with them, and/or they have a personal aesthetic that they've developed that may be 'limited' to certain brands.

Some folks also don't want to go through the effort of constantly/regularly (re-)evaluating things: they've found that Brand X gives them enough quality/value, and have stopped looking.