You could, and probably would. But, how would you send everyone else? That 'traditional' method (carbon based fuels to propel a heavy payload) is extremely ex

You could, and probably would. But, how would you send everyone else? That 'traditional' method (carbon based fuels to propel a heavy payload) is extremely expensive, and slow. So if you ever wanted to send more than just 1 payload, you'd quickly reach resource limitations (namely cost, and time).