You mention and compare commercial products with 'fan games' on BYOND. That is tricky, because a commercial fan game would have to pay a massive chunk to the copyright-holder, so there is a lot more incentive to create 'original content'.
Never mentioned fan games in that paragraph, it's more of an example for him to use on "super-powered", and how Just because Final fantasy was an awesome RPG it didn't stop people from creating they're RPGs. Same goes for other games. I specifically used the Final Fantasy in both examples, because I know about the battle system changes from ff10 to ff12, and the skepticism it got from it's fan base. As for the other thing I mentioned I used it because Chrono Trigger is just an awesome game and so is Final fantasy. Of course halo and modern war would have worked also.
Just telling him that 2 or more "super-powers" (games) can co exist at same time. Of course though like most places some fans will clash over which one is better, some will accept both games as good games, and some will just say both are not good and list games in the genre that are better, sometimes right sometimes wrong.
Saying that most members are paying for, and supporting, BYOND is not a negative point against BYOND. It shows that BYOND can instill loyalty.
Having several games that have huge player bases is in no way an indication of a failing community. If anything you've just proved that BYOND is booning.
Your last point said that BYOND had too many members in some of its games, and now you say there are not enough? Try thinking before typing.
BYOND is the best online community I have ever come across when it comes to supporting newbies. If someone is too stupid to press F1 when they have a simple query, they don't even deserve to be directed there, yet people still take the time to do it.
None of your 'reasons' support your opinion, and most are completely invalid. Go back to school son.