Services and Trades area can be used for whatever you feel it is to you. For example, if you have a speciality and would like to advertise it, you can do so in this section. Be specific as to whether or not you charge, and if you do, how much would the cost of your service be. Do you have a portfolio of your work that we may view before choosing your service?
You are correct, most of the active users in Surmunity are happy Surpass customers. The type of services and trade would probably be limited to web-related services such as web designing, graphics, scripting, etc.. but I guess that would be up to you to decide the limits.
You can feel free to post your request to trade and if anybody is interested, they will reply back to your post. As this forum was developed to help interact fellow members, it is up to you what "trades" you would like to offer and it is up to us to see if we are interested to reply.
Your service and trades don't have to be services directly affiliated by Surpass. If you have an ability, you may post it, as I've said above.
Hope this answers all of your unanswered questions.