I wouldn't pay $100+, but I would put something under. A major leak isn't as likely as a few regular drips in the same spot reoccurring. Considering the subfloor in closet/storage areas is typically chip/pressed board that tends to swell, a little extra protection is just good insurance.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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