Can developers explain why the quantity of available tokens is so unstable?
I have monitored how many tokens are available during 2 last days and I found that it is changes so strange. first it was something about 9k, then the quantity decreased during few hours, but a little bit later it was -10 (minus 10) about 30 miutes. Later it come back to 8k, then decreased gradually to 4k+. After, few times I found that the quantity is 0.
But today it is again more then 7k.
What is it? It look very strange for me. Project is really very interesting but I'm afraid that it can be scam.

Please advise.
Because this is a limited token pre-sale, we have a cart handling our inventory of tokens prior to issuing them. The inventory in the cart is not on the blockchain, it is only an order in the cart. When someone places an order, the inventory is removed to secure the position until payment is made.
If payment is not paid in a timely manner, the tokens are returned to the inventory.
Recently, we have had someone order all the outstanding tokens with no intention of paying for them, which resulted in the temporary 0 that you saw. When this happens, we then cancel the order immediately to restore the inventory.
You can see all the people who have paid for and claimed their tokens on the bitshares blockchain explorer:
http://www.cryptofresh.com/a/PEERPLAYSHope this helps clarify. We are also available to contact in live support if you have any further questions.
Just looking at the stats, there is some great distribution already when looking at the richlist in the provided link.