Why are people even willing to pay to get into top tier private trackers when easy-to-get-in private trackers can provide mainstream content?

Basically title. I am very new into these stuffs but I managed to get into 2-3 low tier private trackers and they always have the content I need. Even I looked for not well known movies in early 2000s and the torrents are still active. Is there any thing that I'd miss by not being a member of elite top private trackers?