It doesn't add value if you have to pay for the service, an infernal cape on an account won't add more value than you pay for cape. If you can get it yourself on the account, do it, it will add significant value.
If a pure it will be significant. Same for mains but obviously less. Like madzy said it really depends on the account I guess.
Depends on the account but look at how much people are charging for inferno services and that’ll give you a rough idea.
