I agree completely.
Editing (image selection, not post-production rendering aesthetics) requires practice and discipline. This is an important part of photography and it is hard work.
I am about to replace two, 2TB external drives of original raw files (main and a back up). For raw-file archives, I am about to upgrade to the next generation (for me) of USB transfer speed. This will cost about $200 (two, 3 TB, USB3 external drives). My current drives will be repurposed as off-site backups. My oldest (slowest) USB drives will be securely wiped and recycled. So far, not counting electricity) raw-file storage hardware cost me about $50 a year for two, 2 TB of raw-file storage.
When I was doing gigs automatically saved every a copy of every raw file upon import to LR. When I stopped doing gigs that became a bad habit.
Now I take a close look before import and do not save obviously flawed raw. I often auto-bracket three exposures at base ISO. During post-production rendering, I only keep the one with optimum exposure (usually judged by highlight retention).
My winter project is to cull a lot of the images in my current LR catalog.