From so many points of views, Bitcoin (BTC) trading is investing with the aim of making profit and making gain,
Trading and investing are two different terms, though used interchangeably often in this forum. Strictly speaking, traders points to those who are day trading. Hodlers mostly come under investors and so does those users who tend to for with altcoin presales hoping for a price rise to dump.
I have understood it purpose and it is vulnerable to it's stakers.
No idea what you meant by that. Staking is a different thing. You stake an asset in order to gain something. It is a type of investing but not commonly seen in bitcoin. Some companies might give you "passive income" for staking your coins with them. It is like giving them a loan.
for one to stake means he/she is ready to profit or lose.
Staking usually is profitable but the ROI might take a longer time. If you are not willing to invest, you can try it. Previously we have had casinos that allowed users to invest on their bankroll - not very common now.
But if you staking in some POS shitcoin, then I would not recommend it.