Looking at the performances of several brands that have been competing in the microphone / consumer electronics spaces.
Fifine - a chinese competitor
Movo - a usa company
Lume - lighting company in USA
Joby - camera/vlog accessories company under Italian parent company
DJI - A massive company in many niches: microphones, cameras, drones
Fifine is doing about $2M/month in revenue on Amazon with a catalog of 296 products with an average revenue per product of $6,550/month. 11 of their 296 listings account for 80% of their total estimated revenue.
This is Fifine’s top selling product: https://www.amazon.com/dp/B0BMFQP2ZZ
The only other type of helpful analysis here would be looking at the total count of parent listings they have.

Movo makes about $225k/month in revenue with 471 products on Amazon with an average revenue per product of $520/month (very low).
17 of their 471 products (3.6%) account for 80% of estimated revenue.

Joby used to be a 3rd party seller but now they have multiple sellers on their listings with Amazon as the main one. Better than “Total Offer Count” would be a metric showing total unique seller count to indicate the number of unique 3rd party sellers selling on a listing as there could be 3 different offers (new, used, etc) coming from the same seller id.
The generate about $51k/month with a catalog of 491 products which is an average revenue per product of $104/month (very low). Since they don’t control the buybox and have multiple third party sellers on their listings they don’t really care that much about their Amazon presence.


DJI - The massive market leader
Across a catalog of ~4,909 products they are generating approximately $28M/month in revenue. The est. revenue per product is $5,580.
39 products out of 4909 (0.8%) account for 80% of their revenue.