Is Buying Gems in "Clash of Clans" Pointless?

Clash of Clans is hugely popular worldwide, as it evident by a world CoC championship with a large pool of money involved, and a plethora of YouTube channels dedicated to CoC that have cropped up recently. It is also famous for its optional in-game purchases, with some people spending real money like crazy to buy in-game gems to boost their villages. But seeing that gems are very easy to obtain in-game, and progression, with or without gemming is fairly fast and easy, aren't these people just being too greedy? They could've gotten their precious builder if they just had waited. But no! They need it right now! And that, to me, sounds fairly stupid. What do you guys think?

I used to play that game. It's really confusing. You have to manage this black stuff, I think blue stuff and coins. I can't even get past some easy levels.

It's not completely pointless because if you're really bad at the game all I do is buy gems which is a complete waste of money because I don't even know what to do with the gems. If you're really good at the game you should gems sometimes. It can help you a lot but if you're that person who likes to earn all their stuff don't buy gems :)