User blog comment:B214/Question and Answers 3/@comment-4547267-20140704034441/@comment-24098614-20140704075247

The Dragon power you state is responsible for everything that Issei has gathered so far because it has attracted its share of enemies along with love interests because if it wasn't for this there wouldn't be no Dxd because Issei would be a normal Human.

I wasn't joking about Vali getting a bigger Harem than Issei if he wanted because he has more to offer the girls in personality but he has a severe flaw in  his personality, and in that is he is obsessed with fighting too much, and there is more to life than just fighting.