What price, beauty? Some events are not for sale

What price would we pay for "once in a lifetime" events? While this might conjure up thoughts of Elton John or the upcoming Super Bowl, some natural events occur that are worthy of an admission price, but no tickets exist for sale.

Years ago while living in Massachusetts, I missed a rare show of the aurora borealis (or the northern lights) and learned only the next day that virtually all my friends and family had seen the awesome display. (Where was Twitter then?) Such events offer no ticket purchases, yet reward those fortunate few with the good luck and timing to be present when they occur.

I recently came across this stunning video below of starlings doing an aeronautical dance. Taped by Liberty Smith and Sophie Windsor Clive during a canoe expedition on Ireland's River Shannon, the viral video captures one of nature's unparalleled beauties. As you view the show, I ask you to wonder what might you pay to witness it?