Quoted from ASOA:Speaker lights animated LCD and a flashy topper always increases visibility. More visible = More Money.
I have never found this to be true. In fact, I have never seen any add-on be worth the extra cost.
Invest in LEDs if you want to do something for visability, but toppers and bright flashy lights on speakers seem to do little IME.
Everything else is pretty spot on.
I always encourage people to provide a minimum of 4 games and make sure you have a variety.
1 Modern, 1 classic DMD, 1 Classic solidstate, and 1 EM
Prices these across the spectrum.
Dont worry about catering to collectors as they already have access to the games. Cater to the players and the casuals.