To be honest, there is absolutely no way of telling who is a genuine buyer who has just joined eBay and who is intending to part you from your item and your money. The one time I was scammed it was by a buyer with over 600 feedback for both buying and selling, no clues there at all.
The items you're listing are scammer magnets, and I will say that you should also be trading on the correct eBay account (little things like this are picked up on by buyers looking for a freebie, it indicates that the seller may be unfamiliar with the platform).
A private seller is one who is just selling off their own personal items such as clothes from their wardrobe, bits from their loft/garage etc. They would not have multiples of the same iPhone or iPad.
A Business seller is someone who buys or makes items to sell on. They need to be registered as a business to meet the requirements of UK law. They need to declare income to HMRC once they reach £1,000 worth of sales (eBay will be providing HMRC with your details anyway no matter what account you're trading on so it's vital to keep correct accounts for your tax return). You can obviously offset more expenses as a business seller, but can't offset any at all as a private one.
To correctly register as a business seller simply go to your Personal Information in your account and to the right of Account Type, which will be showing as 'Individual' you'll see an Edit option.
https://accountsettings.ebay.co.uk/profile
This doesn't affect your feedback profile or any current listings, it merely upgrades your account so that you're compliant with current consumer and eBay policy.
