Add The Street.com's Scott Mortiz to the group of people starting to scrutinize eBay's $4.1-billion foray into VOIP (check out my second thoughts post). An issue that deserves more attention is why eBay felt it had to make the deal - as opposed to how Skype's investors hit the jackpot. You have to wonder if eBay has conceded the high-growth days of its core auction business are numbered - not withstanding its good second-quarter results. If that's the case, it may explain why investors seem less than overwhelmed given how eBay shares have performed recently.