no it's not, bitcoin is a cryptocurrency maybe the price would up or down, bitcoins is also a little bit gumbling. so its up to yo bro
Though the first persons who has been a bitcoiner since beginning are the richest already, it doesnt mean that its already late to join the bitcoin community or add up your bitcoin savings. Bitcoin price rise and fall and that is the risk you need to take if you want to earn bigger profit in the future.
In other hand, there won't be any x30-40 grow in nearer future. Now bitcoin is good investment, but when its price was $ 1000-3000/coin, the things was better.