Channels that get big for the sake of having amazing quality tend to pick up production quality at some point, probably by hiring people. So if you're watching older/larger channels, the correlation won't be as obvious. On the other hand, we can time warp! This is the oldest video on YouTube from Veritasium: https://www.youtube.com/watch?v=cU2dZz18P0c

I'm sure there were plenty of even gankier ones prior since by that time he already had his nice logo sorted out, a pretty good broadcasting setup, and more. In any case, here's his latest video: https://www.youtube.com/watch?v=Q1bSDnuIPbo

Personally I see three bands of content:

1. Produced-for-broadcast-TV content has the highest production costs, and the lowest technical detail. Example: Scrapheap Challenge / Junkyard Wars.

2. Midrange youtube has medium-low production costs, and medium technical detail. Example: Project Binky.

3. University lecture youtube has low production costs, and high technical detail. Example: Look up 'laplace smoothing'

Of course, it's far from an absolute rule - clearly, you can find low-technical-detail content in any production cost band :)

> Considering the channels I follow

No way for that sample to be biased.

It can be completely biased. This is why my definition is probably different than yours in the first place.

On the other hand, your sample may be also biased, so it goes both ways.