It's about the underlying principle: Does this break the game or give those willing to pay real money for these items an inherent advantage over those who aren't, and as such does it diminish the gaming experience of those unwilling to pay extra?
The answer is no. Completing the 25 odd daily quests a week it takes to get the coins you need to be "competitive" is not exactly that difficult. Plus there are a multitude of other sources for these coins anyway - just killing mobs rewards them so you need to do even less dailies than that. My main literally has about 4000 of the damned things - I lost count months ago. In short, if you are a player who is sufficiently competitive to make the argument that you "need" the 50 coins a week, you will easily acquire them without even trying.
They are selling these as "quality of life" items for characters to achieve some semblance of progression given a very tight time budget - which pretty means ultra casuals and alts. Neither qualifies in the "competitive" category, and it doesn't matter how many people out there are buying these things, it won't make an iota of difference to any competitive aspect of WoW (disregarding those 2 guys on some random server who are competing for world first to get to 10 Million Lesser Charms of Good Fortune).