Is it worth to start investing in bitcoin?

If you're in Venezuela or another place with truly affordable electricity, go for it. I never started because that's not the case in my place and I was late to the party.

At this stage, not really. Unless you are very dedicated. A good way to invest would be accepting that for goods and services so you dont have to put money in yourself but rather siphon it off. Wait till prices are low but DO YOU HOMEWORK because this whole thing is turning into a big bubble. It never happened before and it was defying the laws of economics. It still boggles my mind but please dont fall into a pit. Do research.

Nobody can't tell you that. Best way is to have a sum, invest, forget about it and hope to make money in the next 1yr or 10yrs

nope, too many website or company that they remove the bitcoin payments because its not really stable

No , I think no anymore.
Especially in Europe :/
Electricity in europe cost ...

if you have enough money that you can live without then yes

not right now, there are other crypto currencies with pretty good perspectives in the short run.

Bitcoin Prices Have Dropped Dramatically. But it Seems To Fluctuate Quite Often So I Would Say Its Worth It.

I think everything is can when you believe what you do. Just believe and go on.

Nope have missed the boat on that now no point trying