Did Riot ever state a reason why we can't buy Announcer Voice Packs?

After seeing all other major mobas having option to buy their other announcer packs from their store i still can't understand any valid reason why we can't do that in LoL when it has many other well made announcer voices especially Star Guardian Ahri. It's annoying temporarily having a better announcer during events and then force-changing back to that old weird voice from 2009. League should be the first who has these options available but in this case everyone else did it apart from here. And the ridiculous thing is that the regions who have a different default announcer voice like Japan or Korea sounds a lot more better and up to date but NA and other western regions are stuck with the old one.
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