3. San Diego Citizens will build the Convention Center...
Citizens will work there.
Citizens work at the restaurants, shops, hotels, and business's that benefit from these conventions.
A large convention like Comicon brings millions into the city because those who attend spend money in restaurants, shops, stores, hotels, and at other points of interest.
This is not simply a venue to funnel money to out town rich folks.
And as to the owners of the stores, the vast majority of stores now days are large chains. Small, mom and pop retail outfits aren't found in the big shopping malls. But these corporate stores do hire people that live here.
I stand on the side of the thousands of common folk who, though not enriched, are certainly supported by these large public venues.
I would rather see local tax money go to build such places than to see the money funneled into tax breaks for the wealthy and corporations.