Because many jws are true believers that these men will rule in heaven as kings and priests...but forget they don't rule on earth. The WTS even teaches that anointed female jws will rule in heaven. They will get to see God and Jesus and the angels, and other anointed from the past. They will rule not just over the earth but over the angels.
Some think that God communicates with them in a special way telling new information.
(1 Corinthians 4:8) 8 YOU men already have YOUR fill, do YOU? YOU are rich already, are YOU? YOU have begun ruling as kings without us, have YOU? And I wish indeed that YOU had begun ruling as kings, that we also might rule with YOU as kings.
*** w08 1/15 p. 22 par. 12 Counted Worthy to Receive a Kingdom ***
First-century Christians were declared righteous and anointed with holy spirit for the purpose of enabling them to receive their heavenly inheritance. Their anointing did not elevate them to kingship over fellow anointed Christians while still on earth. Evidently, some early Christians lost sight of that fact and began seeking undue prominence among their brothers in the congregation. As a result, Paul was moved to ask: “You men already have your fill, do you? You are rich already, are you? You have begun ruling as kings without us, have you? And I wish indeed that you had begun ruling as kings, that we also might rule with you as kings.” (1 Cor. 4:8) Therefore, Paul reminded anointed ones of his day: “Not that we are the masters over your faith, but we are fellow workers for your joy.”—2 Cor. 1:24.