If I get really great purchasing power, like buying house (maximum) or buying cars and electronic devices easily.
It will happen. I believe it.

... QuantumCoin ever came online. Then I would use the funds to buy QuantumCoin.

Of course, one of the focuses of quantum computers will be to immediately invalidate Bitcoin. So, I should sell out now, while there is still value in Bitcoin. After all, the building of new things like quantum computers isn't always made public until long after it has been developed. Bitcoin might have already been covertly infiltrated in ways that we don't understand.

if i wouldnt have any real money

XT somehow won the majority. I'd also sell if the price went below 200USD.

Yes if XT is accepted by bitcoin community mostly by big miners then there are chances for price raise in near future as bitcoin can compete with Visa kind of giants to process more transactions per second. This will lead to bitcoin to massive adoptions across different sectors.

OI would sell my bitcoins if bitcoin goes down to 150-160$....

"I would sell all my Bitcoins if bitcoin has no price anymore"

I would sell all my Bitcoins if the price for the amount i have can guarantee me a life without stress and worries and can give me wealth and happiness for my whole life

If the price will cover all your whole life spendings that can guarantee your secured future then I doubt you will still sell your coins but instead make and hold more.

I would sell all my Bitcoins if and only if price rise up 10000 usd