The Biggest Mistake That Cost Me Thousands

By Carson Batzel Part 2 of the Carson Commerce eBay Business Builder Series

“I stopped asking, ‘Can I make money on this?’ and started asking, ‘Is this the best use of my money?’” - Carson Batzel

If you've been selling on eBay for any length of time, you've probably experienced this before.

You walk into a thrift store, garage sale, estate sale, or auction and find something that looks like a great deal. You've seen similar items sell before, so you buy it.

Then it sits.

A month goes by.

Then two.

Maybe six.

Eventually you lower the price just to get your money back—or worse, it never sells at all.

I've been there more times than I'd like to admit.

When I first started selling on eBay, I thought the key to growing my business was simply buying more inventory. If something looked profitable, I bought it.

Sometimes I was right.

Many times I wasn't.

What I didn't realize was that every poor buying decision wasn't just costing me the money I spent—it was costing me future opportunities.

Inventory Isn't an Expense. It's an Investment.

Every dollar tied up in inventory is a dollar that can't be used to buy something better.If you spend $50 on an item that sits on your shelf for a year, that $50 isn't working for you.

Now imagine doing that hundreds of times.

Suddenly you have thousands of dollars sitting on shelves instead of generating cash flow.

One of the biggest turning points in my business was when I stopped asking:

"Can I make money on this?"

And started asking:

"Is this the best use of my money?" Those are two completely different questions.

Profit Means Nothing Without Turnover

Many sellers focus on profit per item. I started focusing on profit per dollar invested over time.

Let's say you buy one item for $100 and sell it six months later for $200.

Great.

You made $100.

Now imagine buying four different items for $25 each.

Each one sells within two weeks for $50.

You still invested $100.

You still doubled your money.

But because your money came back much faster, you can repeat the process again... and again... and again.

Over the course of six months, which strategy produces more profit?

This was one of the biggest mindset shifts that helped transform my business.

Cash flow matters.

Inventory turnover matters. The faster your money comes back, the faster your business can grow

Data Beats Gut Feelings

Early on, I bought plenty of things because they "felt" like good deals. Eventually I realized feelings don't pay the bills.

Data does.

Before buying inventory today, I want answers to questions like:

• How often does this actually sell?

• What's the average selling price?

• How many are currently listed?

• How many have sold recently?

• What's my expected profit after fees and shipping?

• How long will my money likely be tied up?

The more questions you answer before buying, the fewer expensive surprises you'll have later.

Every Bad Buy Teaches a Lesson

I still make mistakes. Every experienced reseller does.

The difference is that today's mistakes are much smaller because they're backed by systems instead of emotion.

I've learned that successful eBay businesses aren't built by finding one incredible flip.

They're built by making hundreds—and eventually thousands—of smart buying decisions over time. Consistency always beats chasing the next big score.

Final Thoughts

Looking back, the biggest mistake that cost me thousands wasn't buying the wrong item. It was buying inventory without having a system for evaluating it.

Once I started treating inventory like an investment instead of a gamble, everything began to change.

My shelves became more productive.

My cash flow improved.

Growth became more predictable.

And perhaps most importantly, I stopped hoping my business would grow and started building it intentionally.

If you're serious about building a profitable, scalable eBay business, make sure to check back next week for Part 3 of the eBay Business Builder Series, where I'll explain why treating your eBay business like a side hustle is one of the biggest reasons sellers stay stuck.