I'm just starting to make money using sketchup.
I help to plan events in and around Boston.
Some of the things I've been paid to do were...
Model traffic flow around street closures, show pedestrian flow, describe an area to be a beer garden for liquor license applications(licensed area, exits, security), tent layouts, table layouts, stages, calculate usable area to set guest capacity for fire permits, I can brand a booth with a potential client's logos for the sales team... the list goes on.
I helped with Sail Boston, WFNX/Phoenix Best Music Poll, Harvard Football, Phantom Gourmet BBQ Beach Fest and many, many smaller functions.
A few hotels have hired me to model their function rooms in different layouts to be included in the sales package.
I have an unfinished web site if you want to check it out.
Event3D.blogspot.com
It's just thrown together to have something to link to for clients.