I think it's lose to much, must control the budget before lose to much. I think lose until 0.005 BTC is ok.
If not set budget and control like that, will lose until 100 BTC. For my suggest that amount (50 bitcoins) better do invest.
yeah if we have more than 100 btc then losing 50 btc is not be a problem. but most of people which only have less than 5 btc have big dreams to win much of bitcoin from gambling but some of them is loss more than half from the total amount they have. and yes i am agree to use 50 btc for investment because at least we can see that our bitcoin can works properly and we can have additional income so this will be a good lesson to us to prevent this so we can control our emotion.
It is not possible for me to gamble of 50 bitcoins, because if I have 50 bitcoins then I do no need to gamble because 50 bitcoin in my community means the richest person in the community. 50 bitcoin is about 35000000 in my local currency and it is as big as ordinary person cannot even think of such huge money. If I have such money then I do not need to do any other work for making money.