I'm more of a tech geek, rather than an investor type, but I'm no stranger to investing, but I tend to keep things simple in that area.
If you don't want to do the mining, don't pay for the privilege of someone else profiting from your investment in mining. That is all PMCs are, them taking a nice % cut of the rather small profits and slowly paying your less due the pretty normal nature of bitcoin mining returns lowering over time, ensuring what little profits there was, you won't make back enough to cover your initial investment, but the owner sure would of (though many argue they don't).
That is also why their contracts are so complex, so when they get a lot of complaining investors near the end of their life expectancy who haven't made as much as they hoped, they are off the hook. They care more about that aspect, rather than reinvestment to keep a PMC going for the long term.
The only investment that looked like a mining contract to me that actually turned a good profit for me was ASICMiner, but that was quiet different, that as an investment in a new technology for Bitcoin, rather than someone just buying someone elses tech, something you could of done yourself.
Currency trading is far better for those who don't prefer the aspects of dealing with the mining and only deal with the buy low, sell high principles of turning a profit. Find an few exchanges you can trust, with low fees and give it a try, start low and sensible and it's easy to turn a profit.
Not every exchange will have buy and sells at the same price so you can sometime find a nice gap to make a profit between them.
Just do your research on an exchange first, some have a bad reputation for a reason and for a currency trader you are best staying away from them. Don't let greed get the better of you just because their have good prices.
For example; the Mtgox price is higher than most other exchanges at the moment, but a lot of people have trouble getting Fiat money and Btc out of mtgox, so it's a terrible choice if you want to move your assets around to make the most of prices elsewhere.