Actually having 2.5x your trader level max's your income, and helps you level the skill somewhat faster.

1200 x .87(13%penalty at 1.5x) = 1044x45 = 46,980

1200 x ..62(38%penalty at 2.5x) = 744x75 = 55,800

Based on trader level 30 and 48hr outposts you get roughly 9,000 more every two days and an additional 30 trader xp from the extra outposts.