Should a pizza cost under $10?

That depends on the size of the pizza and what's on it. Most personal pizzas should cost less than $10.

It depends upon what you call pizza.

I am 60+.  In my high school days we had Tony's pizza down the street.  They made a pizza that quite literally had toppings piled 4 inches off the crust.  Each slice was a well balanced meal.  That was pizza.  Sadly this pizza would cost 4 to 10  times what masquerades as pizza these days.  It makes me sad to know that my grand children will never know what real pizza is.In any event, pizza is one of those things that proves the rule of worth... you get what you pay for.

cost me $7 at dominos , one basic pizza with ham and pine apple .

I think it depends of how filling it is. A thick smaller pizza being the same price as a larger thin pizza makes sense to me. 

it's depend on size & flavour.

Some of them do, some of them don't.

DiGiorno pizza is great for less than $10.   Taste just like take out. https://www.walmart.com/ip/DIGIORNO-Original-Risin...

A pizza should cost whatever it costs. There IS no 'should.' You can certainly buy them for under $10. 

A Pizza can cost less than five dollars if you get a small with no toppings

yes, but they also charge you delivery fees, convenience fees, fees for charging fees, etc

Dominos has it for under $10. 

You can probably buy a frozen one for less than that. 

Most pizza chains have it for less than 10 for a medium 1 topping pizza.