Interesting read. Especially the part about the total cost for a guaranteed Dr Blight, I didn't think about this.

I think Dr. Blight will be pretty cheap. Don't forget that there will be more than 20k cards in circulation.
If you look at Black Dragon, it's a bit similar to Dr Blight, has only half the supply, has more power and it's only worth $145 for a lvl 1 card. Of course, the big advantage of Dr. Blight is that it's a neutral splinter.

Otherwise, I also used the same strategy than you and I'm very happy with my decision. The only difference is that I bought 6 packs with my vouchers, so I still have a small chance to find the promo card in my packs. 😃