folke123 wrote:Just as the topic states.
If I understand it correctly seen over a 40 year period gold has outperformed the S&P (Is there anyway I can see how it has performed with the dividends reinvested?) The one thing I can see is that it seems to be more volatile?
So if anyone could help me understand why we don't include gold, or show graphs of gold vs S&P or even better S&P with the dividends reinvested over as long a time as possible that would be great

The best answer to your question is "recency."

During the period from 2000 to 2012 gold got a fair amount of attention in this forum, and since then discussion has died down. If you are personally interested in gold, I would suggest looking at Craig Rowland's website,
http://www.crawlingroad.com . His postings in this forum have been consistently levelheaded and knowledgeable, and the book he co-authored on
The Permanent Portfolio, which I haven't read myself, has been praised here--Taylor Larimore called it "a gem."
Gold isn't a "mainstream" investment. In part, to be fair, it's because before the creation of the GLD ETF, there was no way for ordinary brokerages to sell it or make money off of it. Because its long-term behavior has been extremely spiky, how it seems to have performed, in or outside of a portfolio, depends enormously on the particular choice of the pair of endpoints. Like other commodities, it has registered huge gains and huge losses over rather short periods of time and most of the interest in it by the general public is speculative. The Permanent Portfolio advocates like Craig Rowland, however, do talk about a long-term, disciplined, stay-the-course, Boglehead-like approach.
An issue with gold that can't be sidestepped is that--just like bitcoin--it has a non-financial dimension. That is to say, advocacy for gold is sometimes associated with certain political, ideological, and macroeconomic views. It's important to at least keep an eye out for this, and to be sure you know how you personally stand on these issues.
I personally am a gold skeptic and own no gold in any form except my cheap 10K wedding ring (and the plating on some board-edge connectors in my electronic gear). Bogleheadish writers, such as Burton Malkiel in
A Random Walk Down Wall Street, and Jack Bogle itself, have expressed some cautious and tentative support for a near-token holding of gold in a portfolio, e.g. less than 5%. I don't have the current edition but in the 9th edition Malkiel expresses a rather hedged wishy-washy--or refreshingly frank--opinion:
Burton Malkiel, on pp. 306-7 wrote:Tiptoe through the fields of gold, collectibles, and other investments"
In previous editions of this book I took different positions on whether gold belongs in a well-diversified portfolio... at the start of the 1980s I [was] quite negative.... twenty years late... I became more positive... today, with gold selling at prices near an all-time high I find it hard to be enthusiastic. But there could be a modest role for gold in your portfolio.... even modest holdings (say 5 percent of the portfolio) can be of help to an investor... [but] prudence suggests--at best--a limited role for gold...
Annual income twenty pounds, annual expenditure nineteen nineteen and six, result happiness; Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery.