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Some people on this forum seems to think that the term WoW clone is over-used and some kind of myth but in fact this is what publishers want.
I found this interesting tidbit on the upcoming Zombie MMORG in their FAQ.
"Over the past year we were approached by numerous publishers expressing an interest in partnering with Undead Labs. Not surprisingly, many of them were MMO industry publishers who were drawn to the team’s track record in that industry, and while they were excited to work with our team, most of them wanted us to work on yet another World of Warcraft clone."
So it is not just in our heads, most publishers only want World of Warcraft clones and hence why most MMORPGs are as such and called out as such. It is a fact of the industry.