From the 'answer sheet'...
Why were the Israelites who did not volunteer to return to Jerusalem not necessarily weak in faith? (Ezr 1:3-6) [Jan. 18, w06 1/15 17 ¶5; 19 ¶1] Some Israelites may not have returned to Jerusalem because they were materialistic or lacked appreciation for true worship, but this was not true in every case. The 1,000-mile (1,600 km) journey to Jerusalem took four or five months. Moreover, settling in a land that had remained desolate for 70 years and doing the rebuilding work there would require much physical stamina. Therefore, unfavorable circumstances, such as physical ailments, advanced age, and family obligations, undoubtedly prevented some from returning. Like some of the Israelites who remained in Babylon, many of Jehovah’s Witnesses cannot take up the full-time ministry or serve where the need is greater. Yet, they support and encourage those who can and make voluntary donations to further the Kingdom-preaching and disciple-making work.
Only the Watch Tower Society could turn 'not all Jews returned from Babylon to Jerusalem' into 'give us more money'.