I would invest in a Casino that focused on Video Games. Instead of always giving cash payouts, they would instead pay out in micro-transactions or loot for the game that they machine represented. Each hotel room of course would come with exceptional console systems and a high-end PC, and we would be sponsored by Mountain Dew, with D&D conventions every year.
E3 would then be moved from the convention center where it is, to my new casino which I will dub the "Ferret Gaming Casio Deluxe", and all Armor Games folks will get 10% off their first stay with us if they book 3 days or less. Additionally, we will have an 4D gaming exhibit, a adult version of chuckie-cheese ball bit, and some or of mega-star gaming sensation (TBD).