Google Scares eBay: Report

The auction giant gets about half of its traffic from some form of online advertising, making it very dependent on Google.

"If eBay reduced its spending on Google, revenue at eBay would take a hit," he says. "If eBay stopped spending on Google, the revenue decline would be dramatic and it would be disastrous for the stock. For better or for worse, eBay needs to continue to spend and grow its relationship with Google."

Google will no doubt work hard to persuade eBay from joining forces with its competitors. The Internet auction giant is one of the largest buyers of search advertising, spending most of its $400 million marketing budget with Google, according to the Journal.