Why won't Apple ever create a device that is sd card compatible?

I don't get it. Apple products like the iPod & iPhone never come with extra SD card storage. Its quite unfair of them cause they force you to use their Cloud Wi-Fi storage service & I don't want to. Other leading organisations like Samsung offer expandable storage with SD cards in their galaxy range.

Why are apple so reluctant to make iPods & iPhones that can take SD cards?

Its cause apple is evil and they want every cent of your money they can get. And bear with me here but think about it if you have a 8 gb iphone/ipod and thats not enough than you have to buy a brand new 300$ ipod or 600$ iphone it makes them alot of money they do the same thing with their macs you can't replace hard drives cpus or anything on the inside of it so if it breaks you need a new 2000$ dollar computer and their computers arent even worth 2000$ so they just make that much more money

Indeed. If they sold an iPod with an SDXC slot I would be so there.

SD Cards are slow. Just opt for the 64gb version.

Most Phoe manufactures are shying away from SD Cards, they are a thing of the past.
Use iCloud if you need extra storage. Sync it to your computer more often and remove photos and videos you don't need on your phone.