The workshop lets you turn broken items into repaired, higher-value versions. Buy cheap broken items on the marketplace, repair them, and sell for a profit.
Repair costs scale with the item's base value. A broken phone bought for $5 might cost $3 to repair and sell for $15 — that's the FlipAPenny hustle.
Repaired items still respect the flip penalty. Over-flipping the same item type across many trades will drag the resale price down over time.