Ok, as the donationware experiment totally failed I'm trying a new model now. All Absynth 5 patches are locked with a password, if you make a donation you'll receive the password to your paypal adress giving you access to all available AB5 patches. All MP3 demos are of course unlocked, so are the AB4 patches on my site.
3000 visitors and +10.000 downloads in two months resulted in three donations. That doesn't work for me.