wiki editing is a skill, it is a technical skill but more so a social skill.
different wikis will have different kinds of material and community based on
- the initial goal of the project,
- how clearly that is defined and whether
- the participants understand and agree with the purpose and therefore the criteria for editing..this would be the case with a wikipedia modelled project. - if the project uses different criteria for editing, eg has authorised people or some other means of managing choices the outcomes and participation will vary accordingly.
- the size diversity and commitment/interest of the audience
- the skills of the participants to express themselves effectively in a space where negotiating included content on the basis of fit for purpose, or whatever model is used for choosing and editing material.