In the UK you have to pay value added tax on silver and capital gains tax. You don't have to with gold. This dampens demand for silver.
Are you in the UK? If so, you have my condolences. It is bad enough here in US. I can make the case for Silver but not my job.
10% of Paperback edition of my book as a launch promotion. See below. http://www.bookdepository.co.uk/book/9781624074899