if you use the martingale technique make sure you have enough money,
No none has enough money.
For being successful with martingale strategy, you need unlimited balance. So, no matter how much money you have. Whatever amount of money you have, you will finally lose all that if you use martingale strategy.
You will lose it by playing online as in real life I don't think that if you play roulette 100 times on red to fall 100 times on black,this is not probable but in online they make it possible as there is software controlled game that do it.On the other hand even if you have a huge balance in real life the physical casinos have put in place the max amount you can bet which act as a betting limit and over time you will lose too.Martingale works only in an ideal world where no betting limits are into place and we have unlimited balance,something that does not exist in our world.