Is this normal ico progress? First day a lot of participants and after that a slow decline and the last days probably more participants? Do i get this right? I never joined ico before except Augur and Digix...
I think it depends. Waves created a fair amount of PR for the coin and then offered a day-1 bonus, as opposed to a strict, first-week bonus which is also common.
The typical trend is that their is always a rush at the beginning, it tapers off and then at the end it spikes because a lot of heavier investors also like to evaluate how much to contribute after they see generally how big the ICO size will be. I could see Waves raising between 6500-8500 BTC by the end. That's my guess, unless they start releasing some insanely amazing, "ground breaking" news that gets more attention.