I work at one, and you'd have to make a really good case to a client to factor in $1,500 / month in hosting costs. Even though it's a small sum compared to tota

I work at one, and you'd have to make a really good case to a client to factor in $1,500 / month in hosting costs. Even though it's a small sum compared to total campaign spend, big companies are more into the "wow" factor than anything else. Thus they're more willing to pay for cool designs than that boring hosting stuff. Also, support is extremely important for these big campaigns. Companies want someone to call if things go awry. If Heroku goes down, you're kinda screwed. All we can tell the client is "sorry, Heroku's down. we can't do anything about that." That's something you want to avoid.