Hosted email often comes as part of another service, such as web hosting or Infrastructure-as-a-Service (IaaS). Since that means there will be many extras available with these services, it's inescapable that you'll be paying for those extras in some way. Purchasing them usually means a slight uptick in that per-user price. Many businesses find that, once they're done selecting all of their needed "optional extras," their end price can often reach as high as $10 or more per user. This can start to add up for larger teams. It's somewhat like buying cable service: sometimes you need to pay for the channels you don't want to get the couple of channels that you need. There is also the old adage that "you get what you pay for" when it comes to quality. This is almost always true when considering an email host.
You can also purchase Secure Sockets Layer certificates (starting at $69.99 per year), the software that's represented by a green padlock in your web browser when you visit, say, a financial institution's website. If you plan to sell products via your website, consider an SSL certificate an essential purchase, as it safeguards the data exchange between a customer and your servers.