Trading floor © Image Source, SuperStock

The market continues to truck higher and the S&P 500 is now sitting on roughly 26 percent in profits year-to-date.

But don't expect it to last.

For many reasons, the market appears ripe for a correction. Not a crash, mind you, as the permabears and the bunker crowd would love to see, just a 10 percent to 15 percent dip in the broader indexes to allow reality to catch up with Wall Street.

You see, the face-ripping rally for many stocks in 2013 has been based almost wholly on sentiment. And while optimism goes a long way in capital markets, stock prices can only defy gravity so long before reality beats back unrealistic expectations.

Here are five reasons I expect a double-digit correction in the S&P 500 sometime in the next six months:

Main Street gets bullish

Stock-based mutual funds have sucked up more cash in 2013 than any year since 2004 — $76 billion, to be exact, vs. total outflows of $451 billion from 2006 to 2012.

If you want to be a fatalist, the fact that the "dumb money" is returning to the market is the ultimate sign of a top. Alexandra Scaggs of the Wall Street Journal tracks down a group of inspiring mom-and-pop investors, who offer quotes like "I still think there's huge upside in the stock market … I don't want to miss out."

Sure, the return of retail investors could provide greater buying pressure to the market and push indexes to even more record highs in 2014. But once people start buying stocks simply because stocks are going up, that sounds to me like the very definition of a bubble.

Empty highs

The Dow Jones set its 37th record high on Thursday — and as usual, financial media was happy to alert investors of that fact.

But it's worth noting that eclipses the 34 record highs set in the year of 2007, right before the bottom fell out.

Record highs alone are not sign of a top, of course. After all, in 1995, the market set 69 new highs — a record amount of record highs, if you will — and continued chugging along until the dot-com crash.

But the highs of 2013 feel different insofar that they are given big significance as an "all clear" of sorts. Consider that in 1995, the unemployment rate was in the mid-5 percent range compared with a peak over 8.2 percent in 1992. Also consider that there wasn't a single year in the 1990s with a GDP growth rate of less than 4 percent. A bull market in stocks was great, but also part of a broader narrative of economic might in the decade.

Click here to become a fan of MSN Money on Facebook

That's wasn't the case in 2007 as cracks in the growth story started to emerge. And that certainly isn't the case now as persistently high unemployment and anemic growth are the rule.

More from MarketWatch