Welcome to the Q&A Forum

Recently I've come across a few websites offering (for a fee) to research, write and publish an entry on the likes of Wikipedia, Citizendium or Wikitia - I thought this might be helpful when it comes to marketing and link building for a brand or individual. Purchasing guest blog posts is a standard way to obtain a high domain authority in-context backlink, but I wondered if purchasing an entry on one of these human edited encyclopedias would be as effective, better or not worth the money? It costs quite a bit more than guest posting and blog outreach, but on the other hand they are authoritative websites that also include backlinks. Any thoughts would be most welcome.