For kicks, Goo Goo Dolls bassist Robby Takac logged on to eBay shortly before the May 29 release of "What I Learned About Ego, Opinion, Art & Commerce (1987-2000)" (Warner), a collection of remixes of previously released recordings.He learned all he needed to know about entrepreneurship, audacity, greed and ingenuity from that online auction site."It's astonishing to see, when some folks were finding out this record was coming out, how fast they were putting together bogus copies of it," Takac said recently. "They were sorting through our records, grabbing things and putting together their