And billyjoerob, another thing I don't think you understand is you're thinking about a 25k account, and thinking about a prop shop trading little stuff like that. You're thinking retail, and retail is like Mars, for example, and Venus would be prop firm.
Prop traders trade with leverage... 20:1, some even 50:1
Someone (a professional. Probably has a Series 7 license), who trades a leveraged up $500k account for the firm, and only the firm is far different that the mom, pop, snot nozed 19 year olds, etc., trading $25k in their retail account.
Retail traders can odd lott. They don't trade size, and volume like the prop firm trader.
Prop traders cannot odd lot. They are considered professional, meaning they are MUCH more likely to have a trading "edge/knowledge" vs. the mom, pop, and snot nozed 19 year olds, etc., who are considered dimwits by the regulators. If prop traders could odd lot, they would have an unfair advantage over the retail guy, and a manipulated market.