Now how does this explain the money? Well Spike bought Dru a signed copy of Dracula as a gift and Dracula threw it into a fire pit. Spike wanted to be repaid for it. After all back then it was a lot of money. He even tells him in a note as he saves the girls that he will be back for his money.
This is a great addition to the Buffyverse, it's fun and catches the voices of the different whirlwind members well. The only thing that bothers me about this issue is when Spike talks about Angelus being cursed. No one knows about that except for Darla. She wouldn't tell Spike or Dru, they kept asking but she wouldn't tell them. That's why Angel came and hung out with them for a while. Because they didn't know and Darla wanted to believe that he could still behave like Angelus. Spoiler, he couldn't. Spike still didn't know that Angel had a soul in season 2 episode 3 School Hard, when Spike first showed up in Sunnydale. That is a mistake that bothers the hell out of me. Other than that this is a great first issue to a great series.