It's not an automatic thing for members - After you've been here a while you can ask a Staff/Management member to Evaluate your appraisals. It is up to Our discretion who Earns for appraisals or not. If we see the basic "Copy and Paste" type appraisals where no research,effort, or thought has been put forth - they will not be approved. The same goes for existing members posting those type Appraisals - We can cut them off at our discretion as well.
Many people just post a price or range - but without saying What brought you to that conclusion , It's pretty worthless IMO.
I believe (If it's turned on) Members earn 2 Np$ per post.