woke up with this idea in my head.... a used parts service and small repair's service

the general idea is to collect used and partly broken empegs and dis-Assemble them, keeping the parts that work. this can be on a "donation" basis where users with broken or used empegs can donate them to me or i can buy them very cheap... if done on "donation" basis i had the idea that if another user need parts or repair they only need to pay for the work hours, not the parts