How many stocks that went to zero are in your backtest?

None?

That's worth sitting with. If your dataset only contains survivors, your conclusions are built on a lie of omission.

The two flavors of self-sabotage #

Most self-sabotage in trading looks like one of two things: fear or ego. Fear makes you cut winners early. Ego makes you hold losers forever.

Both feel like discipline in the moment. Neither is.

Every trade has a cost #

Even the "free" ones.

The zero-sum reality #

In the short term, trading behaves like a zero-sum competition before fees, and a negative-sum game after costs. Someone is taking the other side, and they are often better equipped than you are.

Retail traders usually lose on:

• execution quality,
• information speed,
• transaction costs,
• and emotional discipline.

Your capital and infrastructure are not built to beat firms that do this for a living. That's not a judgment call — it's a resource mismatch.

Survivorship bias doesn't care about your objectivity #

Even if you think you're being rational, survivorship bias still sneaks in. You can't fully escape it; you can only design around it. More on that here.

You're still ignoring your failures #

You keep underpricing risk because the upside fantasy feels better than boring accuracy.

Cost #

Start with the obvious: "free" trading is not free.

If you aren't paying explicit commissions, you're still paying through spreads, slippage, payment-for-order-flow dynamics, financing costs, or product upsells. The bill always shows up somewhere.

And then there are the secondary leaks: data subscriptions, premium tools, and recurring fees that look small in isolation and brutal in aggregate.

After-tax returns #

Are you being honest with yourself here? What about to the IRS?

Run the math after taxes, not before.

Short-term gains are taxed harder. Frequent turnover increases tax drag. If your edge is thin, taxes can erase it entirely.

Volatility vs over-under performance #

Volatility distorts your self-evaluation.

In drawdowns, you feel uniquely cursed. In bull runs, you feel uniquely skilled. Both are usually false.

Performance is contextual. Measure against a benchmark and full-cycle results, not whatever mood the tape gives you today.