Kyoshi Frost Wolf

Or maybe it's just because it's an indie title, so it doesn't have as many players to handle on their servers and so they don't need as much money.

but a mediocre generic FP shooter with horrible networking still isn't worth 110$.

Well, there were 64,000 people playing on the Xbox One version on its own just yesterday and I experienced zero network problems. Black Ops 3? It doesn't even have dedicated servers. So lag and disconnects are still common with that horrid franchise, despite selling millions every single year.

It's all about the branding and marketing, something that indie games tend have a hard time doing due to relatively less resources for branding and marketing purposes.