Most people purchase the Plus or Premier package for the alcohol beverage part of it.
When the Plus package was first introduced at $40/day/person, that was significantly less than the price of the beverage package by itself. So for those who like the beverage package, the tips and Internet was a bonus, not an incentive.
Same was true when the package price went up to $50.day/person, just not as big a savings.
And it is true now with the $60/day/person which has the added beverage benefit of including dricks that cost up to $15, not the older limit of $12.
For those who do not buy significant amounts of beverages on board (non-alcohol or alcohol), booking the Standard rate and then paying for tips and Internet continues to be the way to go.