"Copper" plugs have a nickel alloy coating on the copper core of the electrodes.
Even though copper is an excellent conductor, you need to have some other metal covering it.
Platinum and iridium plugs also have a copper core.
Because iridium is more costly than platinum, and harder, they typically have a "fine wire" design for the centre electrode, and may have a platinum-plated ground electrode.
"Laser" as a qualifier doesn't mean anything of importance.
Pricing for various models of plug is all over the map, which isn't surprising given that NGK pleaded guilty to price fixing in their dealings with U.S. automakers.
Other plugs makers were implicated in the conspiracy.
No reason why a traditional "copper" plug should cost more that $3, and a "precious metal" plug should be about $5 if the enormous advertising budget wasn't a factor.