Scam! Really!
Full replacement coverage for personal items with any insurance company is going to have limitations whether it is your RV coverage or your Home Owners policy. If you think not, you really need to look it up.
Full replacement simply means they will pay present value, not depreciated value, on covered items up to policy limitations. If you want full coverage for all your personal items, you will need to purchase a Personal Articles Policy. That policy will schedule those items covered, will normally require the items to be currently appraised, and most often require a photo of the item.
Common sense should tell you that the insurance company is not going to pay an unlimited amount on anything you can carry for a policy charge of $20-$50 a year. As one person said, the most expensive item they carry is $150. Another person could easily have $50,000 in electronic equipment. Do you think the policy price should be the same?
It is not a scam. It is a lack of understanding what you bought. Check your home owner's policy and you will find it is also limited. Most likely for less than that $2,000 computer.