Is there usually a dramatic difference between $5k and $10k cartridges ?

@jasonbourne71 No. An engine costs at least $1m. The cheaper ones are compromises for the poor.

Let’s assume an engine for a BMW automobile costs $10K to build. 

It costs at least $10,000 retail to make a cartridge. Just as it costs at least $200,000 for an automobile. Anything less expensive is merely compromise for the poor.