One of the most important numbers in this game isn’t your total sales — it’s your margin.
Before you even list an item, you should already know:
- Purchase price
- Realistic sale price (based on market data)
- Fees (platform %, payment processing, promotions)
- Extra costs (shipping, packaging, washing, repairs)
A £20 sale can easily shrink to £5 profit (or less) once those are factored in.
When you know your margin upfront, you can:
- Avoid buying unprofitable stock
- Price strategically
- Decide when to liquidate old inventory
- Run your business with confidence
Margin awareness turns guessing into a system — and systems are what let you scale.