The travel agent may get the same rate as you, but in many cases, they get upgrades worth a couple of hundred dollars or more per night, from room class upgrades which are significant to extras like champagne on arrival, free breakfast daily, in some cases even free meals and free spa treatments.
The auction agent ranks the offers by their rate, and then applies to all accepted bids the clearing rate, the lowest rate at which bids will cover all the securities for sale.