Your option's premium is the headline cost. Underneath it sits a stack of smaller charges that barely register on one trade but compound brutally across a scalping volume of trades.

The fee stack

Per-contract commission. Many brokers charge a small fee per contract per side. Trade 5 contracts in and out and that's 10 contract-fees on one round trip.
Regulatory and exchange fees. Small statutory fees (ORF, and on the sell side a tiny SEC/FINRA fee) apply per contract.
Exercise / assignment fees. If an option is exercised or assigned, brokers often charge a separate fee — a cost you avoid entirely by closing before expiration.

Why it matters more for scalpers

A buy-and-hold trader pays the stack twice a year. A scalper pays it on every one of many trades, so a fee that looks trivial per contract becomes a meaningful slice of a thin per-trade edge — right alongside the spread you pay. Costs are the silent partner in every scalping strategy.

A $0.65 contract fee is nothing once. It's real money five hundred times a month. Volume magnifies every cost.

Keeping it down

Three levers: use a broker with low per-contract pricing, close positions rather than letting them exercise (which sidesteps exercise/assignment fees and the whole ITM-settlement mess), and don't overtrade — every marginal trade pays the full stack. Costs won't make a losing strategy win, but ignoring them can make a winning one lose.