What you could do (instead of being a for profit, with investors or advertisers) if you can find a business in a location that has a good view (down the beach, across the park, etc) and that biz already uses a DSL connection, see if they might be willing to co-host the streaming part. The camera merely connects to the server (via the local LAN or direct connect) and then the streaming software running on the local server can stream the video. Perhaps the city of SP or tourism board could kick in a portion of Operating costs to help with the $100/month, and everyone wins.
Just a thought, wish I was ready to re-locate down there, I would love this type of project!