I had to buy new kitchen appliances from BB and a DVD book case, so I hit Premiere Silver super easy. I've enjoyed getting free online shipping so I didn't have to run out to the stores to try and get something like Metroid Prime Trilogy for $20. I also enjoy the point banking and roll over from 2009-2010.
Unless you have to make the perfect storm of purchases in one year (major appliances / big expensive TVs / above low-end laptops), I wouldn't even bother trying to get Premiere Silver status. Unless its a free game, penny guide, or a super cheap game (like $5 Pikmin), there isn't much worth buying at Best Buy that you can't find cheaper elsewhere.
I don't even think they gave me Premiere Silver for a full year as I think its supposed to expire this month even though I earned it in June. Perhaps I'll have to read the fine print again and perhaps argue Best Buy on that point. Luckily my $500 bonus points for the Gamers Club went through, so I'm like 60 points away from 1000 points. Once I get that, I'm cashing out and I'm not even going to bother with trying to get certs in the future, especially if I don't have Premiere Silver.