BUT I would put a couple coins in just because it might just work out, I might just win the lottery and a make a couple coins.
If you gamble some coins on satoshidice, or any of the betting sites, or by playing online poker for bitcoin, you might make a couple of coins and actually get some excitement.
Betting mid/long term on mining derivatives, not a chance. ITs like looking at this graph:

And then betting next month difficulty will be lower. I sure hope that excites you a lot, because it wont make you any coins.
Wrong chart to look at. This is the chart that matters:

The key question is how fast the network is slated to grow to prove ROI. Since it peaked in September, we've been on a very steady decline. Obviously, difficulty isn't going to go into the negative, but the market has been saturated heavily enough to where network increases are likely to follow BTC prices more than innovations in chip development, since everyone is using 28-40nm technology now.