One of the comments on the article was they remove auto tips because they don't know how the money is split. It could be true some people are not computer savvy. However, the information is on the Carnival site under the FAQ. http://www.carnival.com/CMS/FAQs/Gratuities_Tips.aspx
Here is the split of the $10 per day. They site makes it clear tips can be removed at any time. But to me if you feel the stateroom service deserve more then add to the tip.
"For your convenience, we automatically charge the gratuities for dining and stateroom staff to your onboard Sail & Sign account. The total amount is $10.00 per guest, per day (our recommended guideline) as follows:
$ 3.50 Per Day Stateroom Services
$ 5.50 Per Day Dining Room Services
$ 1.00 Per Day Alternative Services: distributed to other kitchen and hotel service staff
For Cruises-To-Nowhere, gratuities of $10 per guest, per day must be prepaid.
Our Staff is totally committed to exceed your expectations in every way possible. If you are not satisfied with the service you receive, we encourage you to contact the Purser’s Information desk while onboard. This will allow us to address your concerns in a timely and appropriate fashion. At your discretion, you may adjust the gratuities at any time.
For beverage purchases, fifteen percent of the bill is automatically added to the Sail & Sign charge. Room Service staff may be tipped as service is rendered. Tipping your Maître d’ is at your discretion, based upon the service you receive."