1.6mil isn't bad. I'll pay you back the cost of making the 2nd one if you want
Max people allowed in a corp depends on the CEO's corp management skills. 10 people per level of corp management. However, the number of players not of the CEO's race depends on the CEO's ethnic relations skill. 20% of the maximum people the CEO can have in a corp can be a different race to the CEO per level.
So with corp man III, and ethnic relations II, you can have 30 people in the corp, 12 of whom can be a different race to you.
There are more skills beyond corp management which allow the corp to have even more players of course. I'm not sure what the maximum number actually is, but the largest corp I can think of off the top of my head is Eve University, which has about 1500 members. So it's quite a lot :P