"why bother" .. I assume you have no off site storage which in our case was about $250 per month and a dirty, spider infested adventure every time you needed to retrieve records for yourself or for a records request. And forget about someone actually spending a weekend sorting through the shed, finding the Adult records that were 10 years old and could go to the shredder. (Peds are age 18 plus 10 years! think about it!)
The in office cost was a space (3 Docs) of almost 400 square feet at $1.50 per square foot per month. Total storage floor space was $900 per month. $10,800 for the year. Not including Labor to go feed the spiders! And it goes on year after year for at least 10 years. You can scan them in during "spare time" for just the cost of the disk space and one or two worn out scanners.
I would revisit this issue periodically and when you have the time, scan and shred!