for you to have weight to your theory, you really need to...

for you to have weight to your theory, you really need to compare traffic and ebay sales results from say 6 -12 months ago to now.

just saying some part of their revenue comes from ebay doesnt mean anything by itself. e.g. they could have suffered a 50% drop in sales volume on ebay from 10,000 to 5,000 per month. your statement would still be valid but the trend would suggest that people are deserting the brand