Quote 引用元:Kraggy 投稿を閲覧
Probably the same reason Blizzard, Turbine, Trion and most other MMO developers I suspect limit the number of instances that can exist at any given time, either in the way Blizzard does with a hard limit or like Turbine which limit people to running a limited number of instances an hour: implementing servers with an effectively infinite capacity is not justifiable based on cost.
I don't recall the last time WOW had limited instances, at least not for the important content like dungeons (plus now most of the open world is partially instanced too, with phasing). There are also plenty of games which did not restrict or try to cap instances, like CoH and Guildwars.