Sure, but again, the criticism of cultural capitalism in this case is about the symbolic value of the disabled - not the conditionality of their work. The difference is that in capitalism everything is ephemeral- that's neither specific to cultural capitalism nor people that have no traditional economic value: in classic industrial-era capitalism, when your widgets weren't flying off the shelves anymore, poof; whereas only in properly cultural capitalism is there a perceived requirement to make amends for your consumption. The point is not that the help to the disabled is conditional, the point is that they are made into props so that the people shopping at wal-mart get pacified and don't feel like they have to start the revolution.

But, since we're going there anyway: Marx struggled to make the labor theory of value work his entire life but never found a way to systematically differentiate it from money, so while its properties might be uncontroversial its existence is. No, presumably in a socialist system there wouldn't be bubbles, but the reason that's the case makes that dubious: the socialist state is ideally a direct manifestation of the will of the workers, and since the workers all collectively know what they want to produce there won't be any speculation about what they will want in the future. However, actual socialist governments don't have access to the infinite information that's assumed, and instead make bubbles like crazy because the state is left in the position of planning development and production, and when the grand plan becomes discordant with people's desires there's a tremendous amount of waste (not saying capitalism aint the most wasteful thing to ever happen). The difference is that afterwards the socialists can organize everyone back onto the farm so everyone doesn't starve.