Why is Slate expensive?

Related questions

1. What is Slate electors?
2. Does slate break easily?
3. Why Electoral College vs popular vote?
4. Can slate roofs last forever?
5. Who owns Slate media?
6. Can you walk on slate roof?
7. Does slate absorb water?
8. What color is light Slate?
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Tags

1. #other
2. #materials
3. #available
4. #expensive
5. #slate
6. #installation
7. #hundreds
8. #roofs
9. #efficient
10. #because
11. #roofing
12. #however
13. #years
14. #sheets
15. #quite
16. #material