I hate how this is basically a swarm deck to get out synchros but you dont have any good synchros that can actually provide you enough protection against the things the meta has now like desparado.
There's a simple explanation: I wanted to try out something new. I agree, a regular Vampire Deck will outperform this variant most of the times, but I really liked the idea of having access to an Extra Deck.
Also, I really wanted to find a way to Summon Zombie-Skull, and it turns out Vampires are pretty much the only one who are capable of doing that in a single turn.
If you wanna summon archfiend zombie skull you can also use pain painter which from the same box and it's name becomes plaguespreader while on the field and has a level adj effect