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If you are not grandfathered then 100 seats runs you $750 a month which is far more than any other engine and paying for your own hosting and paying someone to set up your server for it one time. (unreal, unity, etc on aws/cloud service).
For a development team that runs 100 people $7 a seat is cheap! but if you are running a public alpha and giving those seats to your players you are paying $7 a month for each player to play your game essentially.
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I would like to make one correction to this. The "
Premium Yearly" with 100 seats is
not monthly, but yearly. This covers game hosting, unlimited storage, unlimited bandwidth.
This works out to $7.50 a month per seat or 0.625¢ per month per seat.
http://heroengine.com/heroengine/heroengine-pricingUnity is per month cost and is also per seat, there is no group or Team any longer: Their prices start at $35 to $125 per month per seat. There are also additional limitations and does not include the real time development environment and the first two limit the number of concurrent users.
https://store.unity.com/?_ga=2.35260897.1103212200.1507397052-523997034.1500690251Unreal is essentially free with a 5% royalty, however does not include anything beyond basic tcp/ip like networking for limited number of players nor servers. So you would have to build your own network for an MMO as well as all hosting and bandwidth costs. It also does not have the real time development environment that HE has.
Each engine has its pros and cons, however, I believe, (I might be biased) that HE is the best option out there for an MMO. I hope that helps somewhat.
... <snip>...If you give your players the Hero Player Client they will be unable to "wake" your world which only the HeroEngine or HeroRepo can do. Leaving them unable to login.
There is limited instances that you can launch while developing so if you have to run Area Instances (1) and Area Instances (EDIT) you may quickly reach your cap. Depending on your game design of course.
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Both of these we work with each client based on their needs. This includes the area limits and world "wake up". So not in all cases would these limits apply. Once your game goes to a public alpha/beta there are no limitations or anything like this.
[Edited to add the price page link]