You expected much,
They looked for much but received little because each ran to his own house while God's house lay desolate.
This verse explains the theological reason for their failed expectations.
1In the second year of the reign of Darius, on the first day of the sixth month, the word of the LORD came through Haggai the prophet to Zerubbabel son of Shealtiel, governor of Judah, and to Joshua son of Jehozadak, the high priest, stating 2that this is what the LORD of Hosts says: 3Then the word of the LORD came through Haggai the prophet, saying: 4“Is it a time for you yourselves 5Now this is what the LORD of Hosts says: 6You have planted much 7This is what the LORD of Hosts says: 8Go up into the hills, 9You expected much, 10Therefore, on account of you 11I have summoned a drought