Most sellers see this and celebrate:

39 orders | 44 units | €4,929 revenue
€126.40 average order value

But look at the graph.

Day 16: €6,200 in sales.
Day 17: €800.

This isn’t sustainable growth. It’s a rollercoaster that’s destroying our inventory planning.

THE HIDDEN COSTS OF VOLATILE SALES:

1. INVENTORY CHAOS
When sales swing from 2 units to 21 units daily, how do you forecast? You can’t.

2. PPC CONFUSION
Day 16 ACoS looks amazing. Day 17 looks terrible. But your campaigns didn’t change—the baseline demand did.

3. EMOTIONAL DECISIONS
See the Day 1-5 spike pattern? Without context, you’d think: “Product dying” → panic price cuts → margin collapse.

4. STOCKOUT RISK
That Day 16 spike (€6.2K) likely sold 50+ units. If it depleted inventory, you just triggered a 14-day BSR penalty.

WHAT I’M TRACKING INSTEAD:

Median daily sales (€500-€700 is the real baseline)
Spike causes (Lightning Deal? Competitor stockout? External traffic?)
Inventory buffer (45 days of MEDIAN sales, not average)
TACoS over 30 days (not daily ACoS swings)

THE FIX:

Week 1: Diagnose Day 16 spike (search terms, Buy Box %, traffic source)
Week 2: Test Subscribe & Save (smooth demand)
Week 3: Launch bundle listings (higher AOV = fewer unit swings)
Week 4: Weekly Lightning Deals (controlled spikes vs. random chaos)

I’d rather have €550/day for 30 days than €4,929 in 9 days with daily chaos.

Boring consistency > exciting volatility.

Does your Amazon.de graph look like this?