A broke French founder sold 26 ad spots on his wedding tuxedo for $10,000. After $2,500 in taxes and a $5,500 custom suit, he cleared about $2,000. Then he hired a videographer to deliver content for the sponsors and lost even that. The wedding stunt that went viral for making money made him nothing. Dagobert Renouf had burned over $100,000 on a failed startup and was months from homelessness when he joked on X that companies could sponsor his wedding and write it off as advertising. Someone…