Honestly, I cannot afford to buy them and get many duplicates. I was able to snag the Target series 2 set for cheap (coupons, emp discount) - so that helps. I've bought 2 gold packs at TRU, and I think 3 series 1s.
We haven't gotten any duplicates yet - I did scratch all of them at Target in the series 1 bags. It is no different than standing there and feeling Lego mini-figs for what you want! Only, at $2.99 plus my discount those become more of an impulse. Luckily we have managed to get Scrooge and Pieces of Eight - and they are the ones they want to use the most right now!
But I live 60 miles from TRU - if I'm going to hit them up, it will be planned and a narrow shopping window for exclusives. My boyfriend wants the Tron ones - I may send him to TRU where he is working right now!
Anyway, overall, I can't afford the blind pack thing for as many as there are.... it isn't a good use of my entertainment budget.