If CO is less comfortable due to full flights why do you continue to fly them?

I'm not being confrontational or flippant. Answering the above question will explain WHY their flights are full and people continue to fly CO when they could be on a AA, DL or UA jet with empty seats.

To me, flying with a crew with a good attitude, getting there on time with my luggage, flying on a plane that's less than 15 yrs old---- all of that makes up for the fact that I don't have an empty middle seat next to me.

Not to mention that I worry less about CO going belly up and my OnePass miles going away if they're making money.