i simply buy BTC as an investment or for converting to altcoins. as altcoins are not readily available in india. as BTC is in the market
for me i buy bitcoin mostly for investment purposes, actually in my area there are very little facilities of using bitcoins for buying ans selling purposes, therefore we mostly use it for investment or for trading in alt coins and some time for gambling purposes also.
Investment is really risky, though. You can not expect that the passive income can bring you a good income for your daily needs. All your money which you have invested can be disappeared in a day due to scam project, ponzi scheme. The best way to avoid these situations is to stay away from investment