Cost of e-mini contract - why does it not vary?

I'm a newbie to trading futures coming from the stocks world :)

With stocks as the price goes higher it becomes more expensive to buy something and vice versa. It doesn't seem to be the same with futures? ie. does purchasing a Russell 2000 E-Mini contract (ERT) *always* cost $500? If the Russell index rises a number of points later in the day wouldn't it cost more per contract, or am I missing something?

Thanks for any clarification or pointers to where I can find information about how this works!
 
Quote from mDrake:

Futures are margined based on variances -- not absolute levels.

I know it's semantics but index futures are held through a performance bond, not a margin, although many brokers call it margin. And margin varies from $300 with global futures to approx. $1000 with IB. Most are $500 though.
 
Ah ok thxs I get it now. I was sort of under the impression that we were buying something, but we're not buying anything it's just a "performance bond" that allows us to control a larger amount of money.
 
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