Ya, three seems to be the lower limit for someone who is able to restrain oneself pretty well. And only if one gives away the surplus ones though.
I was not looking to do single bevel only, sorry if it was understood this way. It was more about using more specialized japanese knifes, also double bevel like paring knives or slicers.
Since i'm only cooking at home when i can take my sweet time and don't have to worry about carrying the knives, i was wondering if there might be advantages using more specialized knifes most of the time.