Why do digimon names end in 'mon'? As above, is there a special reason why digimon names end in mon?

This thread says its for marketing but the guy also has the theory of:


  Digimon are digital lifeforms, and are made up of computer data, right? As we know, every kind of data file has an extension, or file format, for example a Microsoft Word document has &quot;.doc&quot; as its extension, a web page has &quot;.html&quot; and an image has &quot;.jpeg&quot;, &quot;.png&quot;, &quot;.gif&quot; etc, so perhaps the same thing applies for Digimon.
  
  by wildwing64
Digimon is like Pokemon where Pokemon is short for Pocket Monsters, that said Digimon is short for Digital Monsters
this is visiable in most logos for Digimon



Also in the first episode of the 4Kids dub of Digimon Adventure when the Digi-destined come back together after finding their Digimon Partners the Digimon says in unision (after Bukamon jumps off Joe's shoulder)

Bukamon: we are.....
All: Digimon! Digital Monsters