For my opinion, people should play gambling just for fun. If a person plays gambling to get rich or pay his/her loans, then the result is certain.
I sometimes bet for sports and especially nowadays for EUR0 2016. I'm only spending 5 or 10 mBTC for each match. If I lose them, I don't be unhappy for that.
Even gambling is just for fun, still gambling is wrong. And even you are betting a very small amount of btc on it.
Remember big things are starting with the smallest one. So, in the end even you are spending small amount of it. Possibility of betting big amount is always there.