Why bother to be a member

I booked a trip via a travel agency due to the fact that we were a large group. I was so disappointed that I will not earn Marriott points for this due to not booking directly. I have spent over $8000 dollars at this hotel, despite calling and requesting that I earn points and chatting to Managment at the hotel I have still not been able to get Marriott to waive the requirement that it must be booked directly. I honestly chose the Westin so that I could earn points. But I regret it, I regret having membership with Marriott bonvoy and staying at the Westin which honestly hasn’t been great