g-unit1111 :
Screen size, aspect ratio and resolution determine the price of a tablet more than storage capacity.
Production volume has a much bigger impact on price than size or aspect ratio, with the high-volume panels ending up much cheaper than anything else.
You see that on desktops with 1080p displays all the way under $100, lower resolutions often being more expensive and higher resolutions being scarcely available below $300. Similarly, UHD display prices are dropping very quickly and are undercutting many 1440p/1600p displays of similar size and comparable quality. For tablets, you see 7" and 8" devices with 800p displays overlapping from $100 to $300 with a few 1200p devices in either screen size around the $200 price point every now and then. There is no clear correlation between display size, resolution and price when using off-the-shelf panels.
The main reason manufacturers charge huge premiums on their premium phones and tablets is: because they (still) can. Once mid-range tablet manufacturers get serious, high-end tablet manufacturers will have a much harder time charging $200 extra for $50 worth of improved parts on top of the $100-200 base model premium. Example of tablet that might make people think twice about $500+ high-end tablets: ZenPad S8, $200 for 32GB storage, 2GB RAM, 2048x1536 8" display, $300 for 64GB of storage, 4GB RAM, a slightly faster SoC and Type-C connector.