Obviously single ownership of a coin wouldn't be feasible. 
Lets say I start a poker site. What percentage of a coin do you think I would need to own? The reason I would want a large percentage is because I want the coin bootstrapped to my site so the more popular it gets the more value is add to the coin.
I guess it would be similar to how the bitcoin was bootstrapped to silkroad in the early years.
So in theroy lets say I have 30% of a coin and start my poker room it takes off and I have thousands of players. The coin was valued at $1 when I started now its at $2.  Now what if when I started I only list the coin on one exchange, mine.  That should increase the value immensely when my poker room takes off right?  Other exchanges are going to buy large amounts thus creating the demand?