But the pleasure principle in either its out-of-control mode or within the limits of what you're terming the reality principle undoubtedly serves consumer capital. Demand for dope, video games and food all results in expanding production, keeps the machine ticking over nicely. Obviously a terminal collapse into pure-pleasure-loop-circuitry would result in the collapse of this form of society. However, its the way the pleasure principle is enslaved to the other drives of Capital that make it so useful.
But demands for drugs of all kinds (opiates for the masses) require (as HMLT pointed out before) a "ban", they ultimately require limits and limitations, to continue to serve as production-expanding forces. Like monkeys, if allowed to go unchecked, humans self-destruct at the hands of powerful drugs: addictions ultimately make people unable to hold jobs, unable to function in society, stop people from spreading out their capital among a diversified portfolio of useless commodities. This is where capitalism becomes so hideously brilliant--ban these things, make addiction "criminal", enhance the pleasure people stand to gain from these activities by making them transgressive and be sure there is an entire penal code set up around them. This serves dual purposes, 1) to attract/seduce more people to give in and try these things that most would rationally be able to tell you are destructive, and 2) helps to create a million new commodities and industries all set up to "control" addiction. If people never had their reality principle tell them they needed rehab, there'd be tons of doctors, rehab centers, pharmacies, pharmaceutical companies, insurance companies, etc. all out of multi-billions of dollars.
Of course, any scientist who studies the mechanism of addiction will tell you that there's no better candidate for addiction than a person who feels unfulfilled, who has no values, who has no sense of duty to any cause higher than their own pleasure. Capitalism creates entire societies of "pre-addicted" addicts just waiting for their drug of choice...