No problem. I'm not sure what kind of blog you run, but if it's something you make money off of (via ad clicks etc) it's going to be worth paying the $13. It's probably going to take a good amount of time for your new blog to get reindexed and actually show ranking in search engines.
Readers who find your old blog through searches will also be left with a page not found error when you delete the old blog, and they are going to then go elsewhere.
It's up to you. Like I said I'm not sure what type of blog you run or what you use it for, but it's something to consider. 1 year is more than enough time to get the search engines to switch to your site from the other site, and they will update their links according to the redirects. So it's really going to be a 1-time $13 fee to move all the search engines over and have all the old links point to your new ones.