Yeah, why would this ancient cat be "at least" 1000 euros? Why would someone say, "oh, I'll pay 1200 euros then!" Perhaps if they were having an auction, the starting price could be 1000, but I'm still not sure the sentence would make sense even in that context. Now, if you said, "an ancient cat will cost at least 1000 euros", like there are multiple ancient cats, and that's the cheapest one, that would make more sense...

-QISta'