You're totally right, my mistake, I was leaving for lunch and didn't pay attention.
My experiment was this: I put
BTC0.0495 and bought a single 0.0480 share (with 0.0015 left in the account)
After the split I bought a couple shares for 0.0056 (0.0028*2) with dividends money, so I have 16 shares.
If I sell them now (at the current 0.0028 sell price) I get
BTC0.0449, but I earned a few more dividends so I'm actually at
BTC0.0465. That's 3 mBTC from even, which is not that far away. Oh well, I won't lose sleep over those 1-2 bucks even if I lose them.
I did another similar experiment and got away with a "huge" 15mBIT profit, so I'm still in the green area overall.
Don't invest more than you're willing to lose, it doesn't matter if it's btc or usd

[edit] sorry, multiple edits to fix the new math