It's combination of you activity and rank, once you get higher you limits will be lower.
Every member has some limits and they are all stickied in meta so go and look there to get more educated about this please.
Thanks for the advice. Will definitely look into there and learn.
Sorry if I did something wrong by posting it here as I was not knowing about this.
Your welcome, hehe you did nothing wrong don't worry.
We are open minded community and we are here to help. I'll search you for the link.
Here it is:
https://bitcointalk.org/index.php?topic=178608.0 you even have the algo written there.