Interesting question, @al1.
As @aronos said, our data feeds are captured from our data aggregator, Yodlee. At this time, Yodlee does not provide any data capture from Ebay.
This leaves us with either manual entry or developing a CSV workflow.
Unfortunately, Ebay appears to be pretty lame in terms of providing data in an accessible & computer-parseable format.
I peeked at my account just now and clicked on Request your eBay data. Looks like it may take a few days to process the request. Will let you know once the data arrives if it looks like it could be integrated into the CSV Line Item Importer.