I wish this were true. I'd say it makes "everyone" a communist instead.
US/UK people who are openly communists or marxists will mostly claim that the true goal of communism is to make sure that workers get paid fair wages (and war in Yugoslavia, occupation of Czechoslovakia.., were just artefacts that have nothing to do with communism etc...).
So, IMO you are missing the fact that there is a very significant bulk of people who are not willing to become market speculators because they are not willing to take direct responsibility for their money. These people can all vote...
I'd say the number of these people will be greater than the number of those who are willing to speculate.