I opened my packs, but that's because I needed/wanted the profits or cards now. I plan to buy more, and looking at previous packs and NFT packs in general, they do seem a good long term investment.

I think that the best short term strategy is to open them now if you got them at a good price, mid term strat is to wait until all packs are sold them open them, and long term would be waiting till after they are sold out and new packs are being released.

Do what you'd like, the 50% strategy seems pretty good! I hope to hold a good deal for the long run before Gen Sale is over.