I only own 40 acres. Nothing to be ashamed of there.
I'm not ashamed of having less than 50 acres. I will be happy to just own my own land. However, I figure that if I purchase 50 acres now, and we decide that we don't need that much land, I can always sell it later. However, if we buy 25 acres now, the adjoining land may not be for sale down the road if we decide that we want more land (and the price will probably be higher).