I see your point, it is truth to it.
However, even Marx took part in the 'system', why? Because you have to wait for the opportune moment for revolution. Look at the 'communist' revolutions the have happened so far, they have all failed, why? Because, if you look at orthodox Marxism, it says the country needs to have to have a developed proletariat and the country where it'd happen, capitalism would need to be matured. Look at China and Russia, they were peasant revolutions, and Engels said the parties may be pushed into a repressive government to maintain its rule. That has happened.
Also, how can you judge 'advanced' capitalism? Germany had been considered advanced pre WW1, look back now, capitalism has become more advanced, technology has also advanced, and the nature of the beast will follow suit to. I personally think capitalism will fall after all the 'sweatshop' countries reform so the capitalists can no longer exploit workers', hopeful thinking, but that's what I think.
Until then, you take part in the system because there is no alternative.