I am fully aware that it would be more people and time for each game alone, but I don’t want to get in this discussion as you could always “make it smaller” and at this scale it does matter to the point.
But the overall discrepancy is, that if you really wound have money to pay 400 people full time, why then…
- post budget for trailer 20-30k $, when the game showcased will cost a 3-digit million $ sum?
- dont have a website and only a gmail e-mail adress?
- dont you put the money serious on the table with youre company for that game and recruiting list for the whole team and GDD-Info at least?
So right now you’re ad sounds like a single, inexperienced guy who wants to make a game that has it all and has no real money to spend on it, and does not even bother to fill out the recruitment template with the basic info.
You can understand that people hesitate to apply to such a dubious approach.
If you’re serious, then set up the basics for such a project professionally, e.g. let some recruiting agencies search the candidates worldwide that you will need for such a project. You’re above posting is NOT the way to do that.