because what they already had was more than enough to do all the work.
Read Exodus 36:7 Using Other Translations
For the stuff they had was sufficient for all the work to make it, and too much.
for the material they had was sufficient to do all the work, and more.
Their contributions were more than enough to complete the whole project.
Scripture quoted by permission. Quotations designated (NIV) are from THE HOLY BIBLE: NEW INTERNATIONAL VERSION®. NIV®. Copyright © 1973, 1978, 1984, 2011 by Biblica. All rights reserved worldwide.
(New International Version Bible Online)