Well if your booking two tickets for two people, then you can't use the other ticket later since the name won't match your id. You could use it for that other person the next time around.

If it goes unused when you pick it up, then just turn it in for an Amtrak voucher good towards a future trip. If you ask for a refund you'll get penalized that 10%. So take a voucher good for a year, and use it towards a future trip.