I can't see anything positive about btc, and still can't get why people are buying it. Can any captain obvious explains? Thanks.
Trying to find the forrest and all you can see is trees?
To understand why bitcoin is useful you have to master a few disciplines and get some perspective. Here's a recent comment I made which partly fits your question:
https://bitcointalk.org/index.php?topic=180297.msg1887433#msg1887433It basically boils down to bitcoin solving a few niche problems, and it will go from there. Here are some:
1) wealth confiscation and reduced/no counter-party risk (brainwallets and free market valuation)
2) quasi-instant trade settlement (no delivery games)
3) financial privacy (user adjustable)
4) batteries included (payment processing)
5) separation of power (money supply governance, miners vs. users)
like any asset class, bitcoin is subject to valuation, which ideally is determined by supply/demand on a free market. Determining the "fair" market value of a bitcoin is the challenge of 2013 and the years to come - it requires a solid foundation for market making.
Hence bitcoin will not solve ONE BIG problem - it will solve many small ones. And by that it will gain stability in valuation. However, look out for alternative coins, as they may try to improve upon particular points and settle for one niche. However, buyer beware - many alternative coins don't improve upon anything and are just .... redundant.