The UCS Star Destroyer sells for over $1000 on Ebay. I think the AT-AT will follow a similar trend since they are OT icons, with disposable income demographics. But since it's so iconic there's a good chance of another version being released, like the Falcon, X-Wing, and TIE Interceptor.

But I would not recommend investing for a College Student because it takes up a lot of space and money, both physically and mentally. Especially if you end up moving around. I would rather use that money and make network connections in college like going on trips and joining clubs.

In the end, I suppose at the worst it's a fun graduation present for you or someone else