Yes, I've figured that, and I would still come back and say ^#{% Obsidian, for not writing that on it before I bought it.
I'm not the type to go into a game every day, if I lose some daily gold, fine, but the time limit is NOT okay, since it was not mentioned before purchase, or even indicated in an understandable way after.
I never spend money on temporary stuff, only permanent, and this really annoys me.