Six speed box is scarcer and more expensive because everyone wants the bragging rights to having a six gear box.
That's fine if you have no torque and an engine output shaft spinning at 9,000rpm like in the RX8. Bolt it up to a torquey motor with a 5 to 6 thousand rpm red line and you'll be setting off in third and wishing you had another cog in the box on the motorway.
Sometimes less is more.
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