It's a tricky question. One man's trash is another man's treasure. The concept of relative value is especially acute in this market. Person A may be willing to pay $1,000 for a project, while Company B may be willing to pay $5,000.
In my opinion, prices are pretty accurate on the platform. However, you should count the work done(hours spent), marketing activities, tech expenses(domain, hosting), maintenance, customer support.
Every case is unique, so it's hard to tell about all listings at once.
