But then I found WhaleClubco. It's a Hong Kong based site that uses 100% bitcoin, with no fiat or altcoins involved. It lets you deposit and get a 100% match using this link: http://www.whaleclubco.com
My favorite part of this exchange is two things:
1) The incredibly simple interface that makes trading really simple. Just buy or sell and it manages the positions separately. You can also SHORT bitcoin price and profit when it's tanking.
2) The site lets you actually do DEMO trading to test out strategies and get comfortable with the interface.
So here's how it works, a little screenshot:
It uses the well-known CryptoWat.ch charting site integrated to the platform, for you to do basic TA and stuff on it. And it uses a liquidity sourcing from major spot exchanges like Bitfinex, Bitstamp, and OKCoin.
Instead of managing complicated average positions, WhaleClub Exchange lets you do separate positions long and short at the same time. Each position you open is isolated into its own separate margin. This means you don't risk your account getting blown up if one of your positions goes against you, it's a great security measure.
So if you're new to trading and trying to figure out what an easy way is to just use bitcoin to profit off BTC/USD price changes, sign up at http://www.whaleclubco.com and get your 100% deposit match so you can start trading LIVE. Or just stick with Demo until you're comfortable, or if you just want to have fun trading play money while you are making your consideration.
Cheers and good luck trading.