The Plus Side
Encrypting inbound and outbound traffic on the internet definitely has some advantages (otherwise the programs that offered this would be impossible to sell). The most apparent of them is that encryption provides security to your data, meaning that if someone intercepts your internet packages, they won't be able to make much sense out of them since all the data will seem like gibberish in the encrypted form. It is like sending a parcel using an armored vehicle, or a safe. For some types of information this is really worthwhile, as it is very sensitive and if it were compromised, it would be quite perilous.
Another advantage of encrypting internet traffic is anonymity. Many people don't realize how important this is, but those who do are very keen on it. If someone monitors internet traffic (and it is very likely that someone does), they are able to derive information about the individuals and the internet community as a whole, based on some statistics. However, if the relevant data are encrypted, this is not possible.
Finally, encrypting internet traffic can be a big plus when it comes to business transactions due to the respect it implies. A business partner or a client, somewhat knowledgeable in the risks of internet fraud, would appreciate your attempt to make the information you exchange with them secure, even if it is just a digital signature. This shows professionalism and responsibility.