Agree. In addition, there are also plenty of artists who either shipped yet died poor (van Gogh, for example) or who were prolific proposers/thinkers/sketchers with "low actual ship rate" (Leonardo never built his helicopter, yet "dreamed in drawing" about it a lot).

Measuring the "influence" of an artist my "number of artworks created and sold" is a bit like measuring academics by "number of papers published". It's at best a very coarse approximation of "the real thing". At worst, total bull.