What are some of the most valuable DC Universe collectibles ever sold, and what makes them so sought after?
How can collectors determine the authenticity and condition of older DC comic books and action figures when purchasing memorabilia?
What are some tips for preserving and displaying DC Universe memorabilia to maintain their value over time?
How do conventions and fan events influence the market and interest in DC Universe memorabilia?
Can you provide an overview of the evolution of DC Universe merchandising, from its early days to the present, and its impact on popular culture?
