Re: So...what did I do wrong?
The basic principle of eBay/PayPal accounts (whether you made it yourself, or bought it from here) is to start slow.
Ideally you want to sell "low risk" items, at a "slow pace", and ensure the "value of each item doesn't exceed around £10".
Once you sell a few, build some positive feedback, then you can begin to speed up the pace of sales, and their respective value, i.e. once you hit 10 positive feedback from sales, you can consider doubling the value of items from £10 to £20... and so on.
The goal is to build a rapport with eBay/PayPal as you go along. When you sell too much, too quick, they deem you too high risk and usually limit you. Some limitations are easily recovered from, others aren't (depending on the level of risk you pose).
If you feel you need to speed up sales quicker, then the only workaround is spreading those sales over multiple accounts.
P.S. There are many more factors to consider, i.e. where your selling, who is paying you etc. that all contributes to a limitation, but the advice given above should be taken as a general guideline. More importantly, it works! | 
