With the signature campaigns this is already possible and you can do some trading or gambling without any doubts for that.
I recommend to do some signature campaigns because its way more safe than other methods nowadays.
To earn 0.1 btc only from signature campaign you need to have multiple account enrolled in multiple campaigns and then that amount can be earned easily on weekly basis.
that is not healthy!
i mean it is good to be able to log in to bitcointalk, post some comments in the afternoon when you are free and get paid for it but to do it in that size i don't think is a good idea. even if you don't get banned you are harming your eyes and wasting electricity.
This is true,some people here are earning on that way and 0.1 per week is just a piece of cake on those people have multiple accounts but it is really not healthy same as you said since you are risking your body on exposing too much in front of a pc whole day.I cant imagine to handle too many account and post required on a single day.Its better to find some investments that could able to maximize your potential earnings per week.