In 2018, the New York Mets sold 2,224,995 tickets. The total was more than 200,000 less than what they sold in 2017 and far below sales in the 2015 and 2016 season.
Understandably so. The 2015 and 2016 Mets went to the postseason. In 2017, there was hope they would go again and a good chunk of those tickets were sold before it all crashed and burned.
Expectations were again high in 2018, but a miserable early summer deflated any of those extra ticket sales for the latter part of the year. Fans stopped showing up when the pennant was out of reach.