I guess for me it's just my personality - I don't like risking/gambling money. I don't play the lotto, I don't play raffles (unless I consider it a "donation" to a group I support), I don't loan money to others, I have no interest in "potentials" for money - I want guarantees. If I am "guaranteed" for sure a certain gain, then ok, I'll think about putting money in...not a chance of gain, not even an excellent
chance of gain - I want to
know how much I will have in X amount of time.
Of course, I do wish I would have put money in on the oil market or Google, but I also wish I would have bought the winning lotto ticket. I know to investors, the lotto and the stock market are no where near the same, but until one can absolutely guarantee a rate of return, without exception, I will not use the market as a way of building or storing wealth. I know of many, and I think everyone knows someone who has played the market and gotten burned....and not all those people were playing it "wrong" or what not.
That all said, I do like matched 401k - because to my little mind, the "risk" is outweighed by the "free" money from the employer. If I put in $500 and the employer puts in $500, total of $1000, and I have a loss of 5% that quarter, I've still "gained" $450 on top of mine. That's good return for me

If it's just me, then that $50 loss isn't a whole lot I guess, but I'm not into paying $50 for a gamble. I don't like up and down.
Finally, I don't think the market is bad at ALL! It's just not at all for me - for the rest of the folks out there, I know it's an important tool for our economy, but it's just not for me. Heck, 50 years ago, I'd be the person burying mason jars in the backyard with cash in them!