Not at all. What you're paid has nothing to do with what value you actually contribute, all you get is the going market rate for your type of labour. Look at it this way: say you work in a dildo factory. You get paid $5 an hour, and with you working it, the dildo machine produces $100 worth of dildos per hour. What happens then is that for five hours of work, the owner of the dildo factory gets $500 worth of dildos. After handling maintenance and business related costs, he gets to keep $400. For your efforts, you get $5, which is the going rate for unskilled labour. In other words, using the means of production you are able to produce $500's worth of goods in five hours, but you have to give away all but 1% of it. And the $5 value has nothing to do with how much value you produce, it's all about how scarce labour is. When labour is plentiful, you can afford to pay people less because they'll be willing to work for peanuts. If the task you perform requires specialized skills, you'll be able to ask for higher pay as there will be fewer people with that level of qualification around. As more people become educated and society grows more skillful, wages will drop due to the increased supply. Socialists consider this fundamentally unjust, as the owners of the means of production (the dildo machine) contribute nothing to the productive process and yet take the majority of the share, and their ownership over the means of production is exploitative and illegitimate (bourgeois capitalists did not forge the machinery we refer to as the means of production using their bare hands and the sweat of their brows, contrary to popular beliefs. In nearly all cases, the means of production was built and designed by workers.) Therefore, we believe that the means of production (and all the dildos it produces) should be owned collectively by the workers who use it as a matter of fundamental justice.
I'm not implying that shareholders pocket all of the gross profits. And I know how business works. Don't condescend. I am telling you that all they care about is net profits. Meaning they are incentivized to pay you as little as humanly possible, cut your benefits and even get rid of your job altogether if they think that that will make them money.
Why would they not care about money? The only reason someone would work in the first place (besides love, and we're not mass-producing dildos out of love) is to make money. It is very much in their interest to do the best job possible, because producing more, better (and therefore more valuable) dildos is makes them more money (the reason they are working), as each worker will be able to enjoy a full share of the profits proportional to the value of the dildos he personally produces. Because their material livelihoods depend on the success of the business, they are incentivized to put out a quality product, maintain their dildo machine, produce enough to keep up with the demand and collectively deal with incompetents and troublemakers in their commune, find more efficient ways to work, improve their product and develop new things.
When the capitalist owns the dildo machine, however, all the workers have to care about is showing up for their shifts and not getting fired. They don't have an interest in working harder than others because it won't result in them getting paid more, because there is a huge unemployed pool of hard workers and the demand is therefore very low. They have no stake in the business or helping it succeed, because they can and likely will be tossed aside at some point when they or the place their work is no longer profitable for the shareholders.