Diablo 4‘s Pit system looks like it should reward you the higher you go, but if you are hoping for better loot drops the more you push, you might be disappointed extremely fast. A recent Reddit discussion went over this exact question. Is pushing high Pit levels actually worth it for loot? The short answer from literally everyone is no.
You can check out the original post here if you are interested:
What Do You Get From Pit Pushing?
Basically, actual Pit Pushing is just for your own personal achievements. There are no benefits of doing it other than that.
Yes, the higher you go you will see a really tiny increase in loot quantity, but not in actual quality. So yeah, you will get more stuff, but not better stuff. And since enemy HP starts scaling in crazy ways, the effort does not really match the reward.
Also, 
Murmuring Obols do increase a little in higher Pits, but most players agree they are not that important anymore, not with better Murmuring Obols farming options available through other content.
If you really want your Pit run to be efficient, it is all about speed clearing, not difficulty pushing. Ideally, you want to clear a Pit in 60-90 seconds. If it is taking longer than 2 minutes, you are probably better off dropping to a lower level.
This is because clearing Pits that way will let you level your Glyphs really fast. Once your Glyphs are maxed, the only real reason to keep pushing high levels is for your own personal achievement. That’s it.
So if you want to make the most out of your Pit run, simply take a level you can comfortably clear under 60 seconds, and farm this one until your Glyphs are max level.
