You are right about that.
And to add, they are stiffer overall in construction as well as they are generally cheaper to buy because most people like the looks of hard tops.
BTW, a 4 door sedan is probably the best choice for a strong bodied race car if you want to build a car on the cheap.
However, most people will overlook this fact because they don't like the looks or are worried that people won't like their ''old man or old lady car''.
I like them personally, but they aren't for everyone of course.
And they are dirt cheap comparatively speaking to buy a good one.