Same as some other.
I only partake in projects which I like and I see a potential for success.
I'm holding until I get the price I want or because I believe in the projects and want to use the tokens to use the platforms or functions in the future.

Prices in all of crypto will fall and rise with bitcoin for a long time.
The most promising part of Dentacoin is that it's a working product that is being used in 15 countries with 32 practices participating overall. This worldwide distribution is just the start, one of these starting points will "blow up" and dentists in that area will all begin using it. I'm hodling my coins so that when it's finally around I can use them for dental treatment  For me it's as much a future health investment as it is a monetary one.

Same as everyone else. It can be very profitable yet also highly risky.
The price is very volatile and your portfolio can lose a lot of value over the course of an hour. The unmentioned aspect here is that if you cash it out predicting a pullback then the price can also go in the other direction, quickly! When you buy back in you're then left with less crypto than you had before, but the same dollar amount. So you're poorer in crypto which is -if you believe in the future of these as currencies and tokenized economies- what you should be aiming to accumulate more of.

Lots of excitement with ETH this year.
Scaling will begin to be addressed at some point this year. If one of more methods proves viable then Ethereum is good to keep climbing in value and improving as a protocol.
Also with the "joke" Vitalik put forward of finding a hardcap for the total supply of ETH gaining raction as a conversation we might see this becoming more of a real thing sooner than we might think. This will put a cap on the total supply of ETH giving us a finite amount and increasing its rarity.
ETH needs to detach itself from the price of BTC, I can see this happening in 2 years. In this time scaling solutions should be well into the works, if not implemented network-wide and many of these Dapps will be beginning to release public beta, or even have passed that stage and heading to real-world adoption increasing the use of the ETH network and the desire for all underlying tokens.
result: HODL

I wonder what will happen to the price if this bitfinex and tether thing goes sour

Not the brightest crayon in the box are we

I thought there were no exchanges in China? Do you mean underground ones? Or are there official ones which just trade NEO?

Good to know, is there a thread somewhere on bitcointalk about this?

Current valuation is, yes, in Bitcoin Cash's favour. However, if we're going on valuation then Bitcoin will be winning for a long time (although BTC isn't in this conversation).
They're both quite young and Bitcoin Cash does have a lot more activity and many more well-known faces behind it (it is also slightly older). The differences are in the protocols of the chains themselves. Bitcoin Cash has larger blocks and therefore can handle larger transaction quantities on the network. Bitcoin Gold does not support Asic mining (a superior mining hardware that far outperforms all that came before), and this protocol difference means that mining can be more decentralized and spread out. Currently, most of the mining power of BTC and BCH is held by those that have been doing it for a long time or who have a lot of money and have large mining farms, therefore controlling a lot of the hash rate, making a lot of the mining profit and getting richer and buying more mining gear (ASIC rigs) and getting large and larger etc etc.
Because of this, I am for Bitcoin Gold over Bitcoin Cash, and will continue to be. Yes, this is a problem that can be solved for BCH by forking the software but it's not going to happen anytime soon, neither for BTC in the near future. Only once such "centralized" mining becomes a problem BTC and/or BCH move away from ASIC mining, potentially scrapping a lot of what BTG has going for it, I just hope it's made it's point by then and has a strong hand.
With the success of NO2X many say that it's been shown that the miners don't control the network. I disagree. They may not control it and they may have been beaten this time but they will come back, they will try and get what they want at some point (whatever that what may be at the time). Eventually it will come to a head and the network (BTC or BCH) will be hardforked away from these mining farms to a non-ASIC mining chain and the ecosystem will suffer. Initially. Then the power of the people will prevail and it will recover. Unless they start selling laptops with built in ASIC miners and we can all crowdsource our mining efforts to compete and level the playing field. (Might go away and draw that up myself right now actually)
Bit more than just BCH vs BTC, but yea that's my take.

I have no future price predictions past its current valuation. I've heard $2.5 before however I only think that would be on the back of the rest of the cryptocurrencies. It has no use cases for us, it is used by banks and institutions, so until Ripple themselves run short of supplies for those use cases we're left holding a dud