If you're already paying someone monthly to "forward" ports, why not just pay for a blog somewhere? Way more secure.

Cause the server in your house is a lot cheaper to upgrade with more RAM/storage than a VPS. By using a VPS as just a way to make traffic available, you can choose an extremely cheap VPS. It's pretty easy to find places that'll charge you $2 USD/month for a tiny VPS with 1TB monthly data transfer allowances; for $5 you can get unlimited data transfer. There's tons of good deals.