if price of PTS is now around 8$, and yesterday was around 15$, does that mean that 1.29 BTS = 7$ and 1BTS ~ 5.4$ if my math is correct
yesterday => today
1PTS 15$ => 1PTS 8$ + 1.29BTS 7$ = 15$
no value is created nor destroyed
Value is created and destroyed because it's all in our mind and thinking. What you mean is energy isn't created or destroyed. That is not the same as value.
So if we change our minds or if we learn new infomation, we can change the value of anything or destroy the value of anything. What doesn't change is the imprint it leaves.
All actions are forever.
The best way to get an estimate of the price is to look at what people are pricing it at on this forum. It's between $100-1000 as a consensus and most people swing toward $500-1000.
But that consensus is how much we think it's worth, how much we actually sell for depends on the other opportunities that exist. Some people might sell some Bitshares to invest in something else, or just to pay their bills. Personally I wouldn't do something so silly but some people might.
The way Bitshares are designed, if it's actually deflationary like I think, then we should be putting every penny we have into BitUSD. BitUSD is more stable than the US dollar at holding value and there is no volatility. It makes sense to put as much money as you can into BitUSD to preserve your profit. If you want to speculate Bitshares will allow for that too.
I think of Bitshares as the perfect stock. It's an even better investment than Asicminer was because Asicminer was only good until difficulty caught up with it.
http://www.reddit.com/r/Bitcoin/comments/1ejcul/6k_invested_in_the_asicminer_ipo_would_value_12m/Bitshares will get better as an investment as it becomes more popular and you can lock your profits in forever in BitUSD.
The only mistake is they went with BitUSD exclusively. There are a lot of other currencies like the Euro for example. I suppose they went with the world reserve currency for a reason.