I don't know why, but I love web scraping. Somehow it's fun to me to be able to grab data and organize it in a DB in a meaningful way. Even better is using the data to make money.
I wrote my own scraper framework for various page types (I don't want to go into too many details) and my latest uses approx 500GB of bandwidth/month. I run it on one VPS for around $50/month.