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First of all, I apologize for the provocative thread title and the username. They're for attention reasons only.
I'm doing a small academic research on MMORPG gamer behaviour. The research topic plays largely around the "sandbox vs themepark" subject (even though I personally do not like those terms, about some damn time for the genre to move on!).
Now, putting aside all the prevailing MMORPG market conditions (larger companies are too afraid to produce a big budget sandbox game since themepark is cashcow). What I nor my colleagues have not figured out is: why the "themepark" oriented crowd seem to proclaim every game in this genre to suit their needs? I.e. when publishers are talking about releasing sandbox/RvR/PvP-heavy games I can see tons of articles, forum posts and even people come to me in person saying "Hey, did you hear about this new game X? It sounds awesome, I just hope there isn't any open world PvP in it! I hope the PvP crowd would go play Darkfall/Mortal Online/Eve/Insert some low budget game here."
This brings me to question the typical themepark crowd's true motivations of gaming, are they just hopping from one game to another? There are so many options to choose from in the market for players who prefer themepark games. Why should Archeage/Everquest Next/Black Desert and so many others cater just their needs?
Please bear in mind, my research is 100% neutral and I have studied this solely based on my observations on themepark crowd behaviour (I can't see sandbox fans urging publishers to add open world PvP or other elements to pure themepark games such as WoW etc). I myself, I like a good game, no matter if it's called themepark or sandbox.
Also, please keep in mind: this is not a "sandbox vs themepark" discussion (even though my research subject largely is), but a direct question to themepark fans why every other game should be a themepark game too.
TL;DR: There are tons of themepark games for themepark fans to choose from. Why do they want every sandbox game to mold into a themepark too?