It is still worth to use bitcoins because the value has increased and satoshi's will still be on the same track. Before you are thinking that 0.005 BTC is still a cheap amount of Bitcoin but right now the price is high and you may think it's gold and you can now reduce it to lower amount. But if you don't want to do this, you can just simply use alt coins.
Yes before I use to bet min 0.005 BTC actually I will place 0.01 BTC when ever I play sports betting. Becasue I will get a decent return. But what you said it is right it becomes too costly if I convert 0.005 BTC to our fiat currency it is approximately one day salary for two years experienced IT people. Now tell me is it fine to play gambling with Bitcoin?