You are posting questions everyday that show that you are still new and not familiar with how the game works.
It would be better if you spent some time, click all the links, read and learn how the game works, instead of trying to suggest changes right now.
'Is there an HSX suggestions box?'
You do not even know what the different forums are for. Yesterday you were posting strategy and tip requests on the movie board instead of the players board (which was designed for talking about strategy and tips).
HSX Navigation bar --> Community --> Fourms:
Report problems and offer suggestions to The Powers That Be. They welcome your comments and are happy to answer your questions.
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You already posted your suggestion on the movies board. It is a bad suggestion from somebody who is not familiar with the game. All players are allowed to invest in the same amount of shares so no one player has more influence over a stock's movement than any other player. Its like each player gets one vote about whether a stock's price should go up or go down. You can change your vote at any time... but each player only gets that one vote.
"Your port grows, but the big opportunities don't. So your options for growth become very limited."
You currently have a port worth $44mill. 1 HSX Player made 51mill last week (more than your entire port); 2 HSX Players made 43mill; 1 HSX Player made 37mill;... I made 24mill.
"The big opportunities seem to be limited, so under the current model, it seems like growth becomes exponentially more difficult as your port value increases."
I am currently the manager of The African American Fund (AFRAM). I started with $20mill on 7/29/14 (almost 3 months ago). I can only trade African American starbonds and the movies that they are attached to. In less than three months my fund (with the limitations) started with less money than your port and has made around $50mill (more than your entire port). Again, you are not familiar with the game.
You might have great ideas and suggestions in the future that could be useful, but right now you do not even know the basics about how the game works. You should take the time and learn how the game works, how the industry works, which websites to read, etc...
There are several great fansites listed under the community tab. You can also read previous posts on the players boards to see questions that other players have already asked and see the answers that they recieved. There are also several leagues that have been started by experienced players that focus on helping newer players to learn the game.