Spread Cost Is Widest When You Want to Enter
There is an unhappy coincidence at the heart of trading breakouts with options. The moment the setup fires is the moment the market for the option is least willing to quote you a fair price. Both facts have the same cause, which is that the open is fast and uncertain, and one of them is entirely absent from any analysis performed on a chart of the underlying.
Why the Quote Widens
A market maker quoting an option is offering to take the other side of a position they will need to hedge. The width of the quote reflects how confident they are about the price of that hedge and how much risk they carry between accepting your order and offsetting it.
At the open, the underlying is moving quickly, implied volatility is unsettled, and the hedge they will need is more expensive to establish. The rational response is to quote wider. This is not an unfairness being done to you. It is the price of demanding a firm quote during the least predictable part of the day, and it narrows later precisely because conditions become more predictable.
The Round Trip, Not the Entry
The cost people underestimate is not the spread at entry but the spread twice. You cross it going in, and unless you exit at a much calmer moment, you cross something similar coming out. A trade held for twenty minutes may pay both halves at close to full width.
What makes this dangerous rather than merely annoying is that it does not scale with how right you were. A breakout that moves substantially in your favour absorbs the round trip easily. A breakout that moves modestly in your favour may be entirely consumed by it. The underlying chart shows a small winner and the account shows a loss, and nothing about the analysis was wrong.
Which Contracts Suffer Most
The width is not uniform across the option chain. Contracts close to the money on heavily traded underlyings are quoted most competitively because they attract the most interest. Move away from the money, or into a less liquid underlying, and the quote widens considerably, sometimes to the point where the spread alone exceeds a plausible target for the trade.
Far out of the money contracts are the trap here, because their low absolute premium makes the spread look small in currency terms while being enormous as a fraction of the price paid. A contract quoted at a low premium with a spread that represents a substantial slice of that premium requires a large move simply to break even, and that requirement is invisible unless you look at the spread as a percentage of what you are paying rather than as a number.
Practical Reductions
Some of this cost is avoidable. Working a limit order between the quoted prices rather than paying the offer will often fill on an actively traded contract, at the cost of occasionally missing the entry. Whether that trade is worthwhile depends on how often a missed entry would have been a winner, which is measurable if you record the misses.
Choosing contracts closer to the money reduces the proportional spread even though it raises the premium. Choosing a more heavily traded underlying does the same. Waiting a few minutes after the open before entering narrows the quote, though it also means entering later into the move, which is a genuine cost rather than a free improvement.
Counting It Honestly
The habit worth building is to record the actual fill prices on both sides of every trade and compare them with the mid price at the time. That number is the true cost of using this instrument, and most people who have never measured it are surprised by the total across a month.
Once it is measured, the decision becomes clear rather than theoretical. If the round trip consumes a large fraction of a typical winning trade, the strategy is not viable in options regardless of how good the entries are, and no amount of refinement to the setup will fix it. If it consumes a small fraction, the concern can be set aside. Either answer is useful, and neither is available to someone who has only ever looked at the underlying's chart.