That's because you've ignored it. You already made up your mind before you posted this thread, and aren't really interested in the input of others, that's pretty clear. The overwhelming majority of AKs are 7.26, this is known. A smaller but seemingly growing number are 5.45. You made this thread, waited for someone to mention 7.62 and then started in with your real purpose of the thread which is to bash other cartridges, which is fine, you don't have to like or use them.
I can buy 7.62 for cheap in all 50 states, no mail order required. Let me know when your average Walmart, Bass Pro Shops, corner supply store has 5.45 in stock and the average person can go buy it and take it home the same day. I'll repeat what I said earlier. I can go buy 1000 rounds of 7.62, right now, today for about $200 and take it home, today.
For the record I can and use them all. I have no investment in any cartridge or platform. It's a tool box and I use what works best with a given platform at the best price and availability. 5.45 will continue to be a niche market in the US for the foreseeable future.