bitcoin makes valuable because of its own demand each day. more (small, big, company) business now are adopting bitcoin (cryptocurrency) as a mode of payment online. as you can see the graph of bitcoin last year pump huge, and they think that pump has never ending, but after year end (2017) bitcoin price dropped and its rolling around $10k+ - $11k+ now. meaning the value of bitcoin is in the users/holders, if they dump a huge amount of bitcoin each day, the value will drop but if they buy and hold more amount, the value will pump. and that makes bitcoin valuable.

The emission limit makes the Crypto currency deflationary, that is, they will not be systematically depreciated due to the appearance of new currencies, but may become more expensive due to the increasing complexity of generation.

Bitcoin is valuable because it is the first cryptocoin. If an investor wants to join this sector, he firstly buys bitcoin. And bitcoin is seen as the whole cryptosector. If btc falls, the others fall too. It is like the name of cryptocoins.

Probably because the bitcoin is safe and the transaction system is fast which makes bitcoin worth now. I am sure in the future bitcoin aja be very useful for people who want to use fast payment.

It became valuable due to high demand, and being decentralized of it untraceable transaction that cannot determine on how much you sent, and as you can see bitcoin has many benefits that we can use in our daily life's we can convert it through our fiat that we can use to buy some stuffs.

i will not say that compared to usuall financial money bitcion also has a bright potential. just based on what my friends told me, what makes btc valuable is it is safe, has a great potential for investment, and easy to understand.

For me,  the only thing that makes bitcoin valuable is itself. Bitcoin helps me and other people here in bitcoin world that grab some opportunities to make some money and earn a lot of bitcoin here.  It gives us an opportunities to make ourself a wealthy person and become better one.

If we discard the various theories that are so fond of clogging the head of all sorts of schools and teachings and wonder "what is the value in fact?"that chain of logical reasoning, in the end, you will be able to come around to this: value is determined by the aggregate desires of people to own (use) a certain asset and its rarity. Rarity until we drop. Let's think about the first point. What makes people use or own? Answer: usefulness.
Ask yourself ," what is bitcoin useful for People?"Why is he attracting more and more supporters? No one is being forced (unlike public money imposed by legislative methods) to use them. However, enjoy (sometimes even contrary). Means? useful his properties outweigh keep barriers, and quite strongly.
Mining has nothing to do with this issue. This is just one of the possible mechanisms for ensuring the TECHNICAL functioning of the network. It can be replaced with other mechanisms (some of which can be more effective — i.e. consume less energy, etc.), although it is unlikely, if the community so desires. So do not get hung up on it, throw it away yet, and think in another plane.

Gold is valuable because everybody agree that it is valuable. Bitcoin became valuable now because it is becoming so popular and everybody wanted to have a piece of it and while it is very scarce, that makes it so valuable now. Scarcity is the main characteristic why bitcoin is so expensive.