here said that the maximum number of coins 31 million but I see that already there are about 33 million or am I mistaken?
Yes, inflation of this coin is a bit high right now and should be reduced; don't you agree?
sorry for the stupid question but I can't understand how they can become less then?
Your question can be interpreted as two different questions, and this is the answers based on my own opinion,
1. How psb can become less (as in the value)? The nature of an inflation is to reduce the value of one currency as the amount of the currency circulating on the market increases.
2. How to make it less (as in reduce the circulating amount)? The easiest method is to take some amount from the market to developer's system and burn it. There are many case of developers burning certain amount of their coins to increase their rate.
Correct me if I'm wrong.
The first option will need a good investor to buy OTC most of the coins and gain most of the part of the coins in circulation, if this investor have strong hands, then PSB just might increased in value, but if this investor is just a short flipper of coins, it might just kill the coin in due course no matter how good the coin is.
The second option has been done by the other coins in order to increase the value of each coin, reduce the max supply by burning , this might do a quick fix on the value of the coin but it is just superficial, besides the coin has already added 10M on its maximum supply , reducing or burning its coins is just showing the level of confidence of its creators.. and one thing more, 33M is not the last maximum count of the supply, do not forget the coin has 5% increase per anum, which means the total supply increases every year.. the 33M is not fixed.
Sorry but face the fact that this is dead. No more funds.
Who has no more funds?
When people starts telling that a certain coin is dead, it only means its the best time to invest or buy at a lower price. This coin has some usage and have the mechanism in hand to convert PSB directly to fiat , and have teamed up with vmoney where you can get the debit cards to use them any way you want to. 
