I don't think Adam is being "mean" but is realistic. I would echo the concern that the employer is not paying for this. We have facilities around the country and require candidates for certain positions to be interviewed at corporate. We typically give several days if not a week's notice and always pay for the ticket and related expenses.

If the employer is not willing to pay, it may mean they already have a candidate they are willing to hire and may not truly consider you a candidate.