Yes, it's true that digiatal signals are 1's and 0's when broken down to it's simplest form, but the issue isn't whether the signal gets through (all HDMI cables functioning properly will get the signal through), the issue is HOW it gets through, and what it looks like when it does. Some of the underlying factors that will affect picture quality have to do with signal loss and signal decay (yes, there is a difference), although on cables under 8 ft. it's usually a minimal factor, but still present. The other prominent issue is signal transfer and signal re-production. What normally contributes to good signal transfer and a good signal re-production is build quality. The AudioQuest cables have some of the best build quality I have seen. That being said, I would never pay street retail for them or any other cable, but there is a difference, and when it's this affordable, it's one you should consider if the price is in your range, and the quality is important to you.
I bought my AudioQuest cables at a high end audio dealer with a Marantz blu-ray player. Both were used, "demos" as it were, and I paid $45 at the time for what was probably a $120 6 ft. cable at retail. I then tested 6 cables, including the AudioQuest on the EXACT same blu-ray player and HDTV, with the EXACT same media source(s). The AudioQuest were the best, but only slightly better than the Vizio cables I bought for $35 at the time. The Sony were next, followed by the Mediabridge cables sold here on Amazon for $10, then the Belkin cables, and lastly the Philips. I am NOT an advocate of spending a lot of money on cables of ANY kind, but there is a difference, albeit sometimes only slight, in ALL cables. Decide for yourself, but make an informed decision, and be open minded to what you need, what you want, and ultimately, what you will pay for your choice.