Only you can decide, OP.
Make the decision fast, because, even though you might have the link to it, the survey might have closed by the time you do decide to do it.
Do it and see.
I think when I did the e-Rewards thingo, I got 2000 points and got $10 off at Woolworths.
So, to guess it would be/should be 6000 points..
Hard to say though, because if you answer an early part of the survey not to their liking, you can be zonked out at the very first few questions.
Sometimes too my laptop dropped out, and when I try to get back in, it said not found.
Best of luck though.