Jeffery Citron must think that Vonage (VG) is a buy. He is spending $1.26 million of his own money to buy shares in his company. The New York Post reports that he bought shares on August 4 at $6.41 to $6.90 a share. As we all know how poorly the company stock has done since its IPO a few months ago, this would seem like a confidence inspiring move. Or is there something else?