There is a reason for this though (beyond profits): Too much crap on the pizza and the pizza won't cook properly. Particularily the cheese won't melt fully. Nor will the cheese fully cover everything. So you'd need more cheese, but you'd need it to cook longer, but that'll burn the crust. What would have to be done to cook the pizza properly is to reduce the oven temperature and cook longer, but since the ovens work on a conveyer, and you can't slow down your whole production just to cook one pizza, you have to make conscessions to provide a uniform product.
If you ordered the supreme style pizza, which has 7 toppings, the topping amount for each is half what you'd get if you just wanted one of the toppings. It might sound like a rip-off not getting the "full" amount, but trust me, the pizza simply won't work if you put that much crap on it.
Tell that to Ye Olde Pizza Joynt on Hesperian in Hayward CA. You can't see the pizza through the toppings and cheese snappy strings a ton with each bite. Their pizzas form a small arc in cross section due the stuff heaped on em. They used old brick ovens - no conveyors - and everything was cooked through and through. Check this review:
Ye Olde Pizza Joynt (It also links to their web site.) Unfortunately there was a fire in 2003 that damaged the facility and the fantastic Wurlitzer organ - whose pipes and percussion instruments surrounded the interior - and I'm not sure if they've reopened.) This is/was pizza and good times the way it is meant to be but therein lies the key and back to your point - it is about fast food chain pizza and profit.
To make a decent pizza most of the chains have confused quality and replaced it with speed of delivery, profit, and efficiency to appease our me now soccer mom tastes. Some, like Mountain Mikes and Round Table, still use quality products and turn out a somewhat decent pie but they remain small chains due to pricing and wait times.
As for the national chains all iI can say is, caccati in mano e prenditi a schiaffi, and you'll have the same effect. Papa John would turn any surviving progeny into raving psychotics with the unnatural combination of purported natural ingredients they use on their imitation shingles. (And DaveH's term, extended sausage, sounds more like a biological result of viewing Jessica Alba naked on my sofa and yes, that would be a meat fill-her
). Assembly line appetizer, main course, and desert pizzas rule at CiCi's for a cheap price and a truly mediocre dining experience (the kids love it though and hence the cycle of tastelessness continues). Pizza Hut.....ehhhhhh average taste for an average pie. Godfathers.....ditto. Domino's......haven't had any in years but it sounds like they've improved on a pie that was a paragon of culinary mediocrity so I won't comment on current. Little Caeser's....Pizza! Pizza!.....Not! Not! :barf:
Shakey's used to be sorta decent stuff and a good place to gather but they're down to 63 stores in the US whereas I recall eating a slice of yaki soba pizza outside Kadena AB Japan that tasted more like yak poopy. They've been catering to international local tastes or lack thereof as belies their more than 400 stores worldwide.
Your best pizzas are at your locally owned and operated restaurants but you have to search before you find the good ones. So happy hunting, apparecchia la tavola, e buon appetito!!
j