Business speaking (aka, from a different viewpoint), we don't sell a work
We sell time (or huge pocket watches) and time is limited.
However, our time could cost more depending on our expertise/experience/image.
Let's say we have two customers.
Usually, the project of 3 months costs 3 times the project of 1 month. We could add an extra to the 1-month project but it is optional.
However, time is the factor but it's not the only factor, for example, difficulty, discount (if the customer is regular), exclusivity and so on.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.