From the eBay site:
eBay’s Sales Reports give you the detailed information you need to understand your business and sell more successfully on eBay. With a Sales Reports subscription you can:
- Measure your sales performance against your sales goals
- Find out which factors contribute to sales
- Determine areas of opportunity and areas for improvement
- Refine your selling strategies to ensure success
Here’s just a sample of what you can learn about your business with a Sales Reports or Sales Reports Plus subscription:
- Total sales
- Successful listings
- Average sale price
- Month-to-month sales growth
- eBay and PayPal fees
The basic version is free; the Plus version is $4.99/month (free for Stores).
Details here.