I really hate when people say that. Just say in obvious terms. If you can find the value of getting such messaging app in one place is worth $15 for you, then thr price might be suitable for you, give it a try.
That is way more respectful marketing. I really am coffee addicted (by virtue of being a physicist) and my monthly coffee consumption doesn't cost me that much because I don't drink cofee at inflated places with brand names. I make them home and in my office like any normal person.