I Bought 12 BROKEN Nintendo 3DS's - Can I Fix Them?

I Bought 12 BROKEN Nintendo 3DS's - Can I Fix Them? I bought 9 3DS handhelds and 3 3DS XLs on eBay for $425. They were sold as a parts or repair lot but the listing said some of them were untested. Once I started testing them I did find a few that were already working correctly... and a bunch that needed repaired. To get these fixed I fixed sticky buttons, replaced a lower screen, removed parental controls, replaced an R button, fixed a camera lens, replaced a top screen protector, reconnected a ribbon cable to fix an on/off issue, and replaced a wifi module. After subtracting selling and shipping costs I'm expecting to make about $21 each when I sell these repaired 3DS's.