Just to be clear, these bundled purchases (from on the UA site) are via a third party travel agent (
United Vacations), and yes you can get some decent bulk airfare prices. Some have done this booking just one night of lodging and skipping the lodging. Just remember the potential issues of bulk fare -- restricted fare rules especially on changes or refunds, occasionally not upgradeable, .... but with a good understanding of the pros/cons, these can be an attractive deal.