Shipping (delivery) charges !
Is this the Marriott next to the convention center?
If so, these fees has become pretty standard. Convention centers in union states charge a small fortune for drayage fees.
The hotels charge these fees so that convention vendors do not send hundreds of pounds of freight to the hotel, bypassing the convention center fees.
We may not like it, but the hotels need to protect their employees from being used as beasts of burden, incurring workers comp and excess turnover. Not everyone tips the hotel staff anymore ...
I will have lighter items delivered to the hotel for a convention and just pay the fees. Heavier stuff, like the 5,000 catalogs we gave out at InfoCOMM, go straight to the convention center.