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The numbers for the balance requirement change based on BTC price and the others based on how much free BTC you have won from free rolls.
Is the amount of money in my account changing every day?
I mean, if I add money today at the request of the site, and I keep it in my account, do I need to more money into my account the next time I redeem the bonus points?
Is there a specific amount of money I need to keep in my account?
As I just said both the exchange rate and what you do on the site will affect what the amount is. Buying lottery tickets and wagering bring the amount down and free roll winnings increase it.