The reason was actually quite far from my usual turf. One of the prizes went to prof. Stanisław Mossakowski for the monography od Sigismundus Chapel at the Wawel Castle in Cracow. Interviewed he has said that he has been working alone, without special grants:
Thanks to this I was happy to work for the sheer pleasure that may come out only from selfless scientific research. If I had signed a contract the results would be probably worse. As it was, I had no schedules to meet and I had the pleasure of work.
What could be more optimistic than such account?