IB vs CapitalSpread

Can some 1 explain my why most FX trader use IB (idealpro)
for trading??

IB = Interactivebrokers
C.S. = CapitalSpread

Cuz seem to me for 100K with C.S. = 10$ the pips and the inital Margin is 400$

for IB 100K = 10$ the pips the initial margin is 2 000$

Am i missing something?
Can some from explain it to me ????

2000 - 400 = 1 600$$ i can buy 3 other contract..:confused:

what am i missing.........
 
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