many but it will make BTC expensive , because total investment / (total supply - total lost forever) is more than total investment/ total supply
this is correct. bitcoin's totally circulation amount is reducing day by day. specially after those so many altcoin projects and their ICO... thousands of BTC still frozen in ICO escrow addresses. thats also a reason of bitcoin price increase.
Certainly that is not the reason, do your know that when an ICO does not succeed, normally the investors will be refunded if such funds are in escrow. And how much really is the amount of ICO raise, it does not even reach 100,000 of bitcoins while we have millions of supply.