This may seem like an elementary issue for some but I know many, especially first time info product marketers tend to wonder and worry about bandwidth issues. Do you upload your product to your own web site or to Amazon S3 or another file hosting service.
If the product is only a simple PDF or a collection of documents, audios and PDF’s, I’d host it on my own site. As a matter of fact, I host almost all of my products on the web site itself. In the 4+ years I have marketed video info products, I have never had a problem with bandwidth. Although, if you anticipate huge sales you may have to start re-thinking this. However, for most startups that I know, bandwidth is not an issue.
Where it could be an issue is web space. If you have a small web hosting plan and are delivering a lot of large audios and videos, you could run out of space quickly. Documents and PDF space is negligible. Overall, the answer is take a look at your product. If it’s a simple product – chances are it is, then host it yourself. 99% of the time, you won’t have any issues.