Agreed that it is a little out of hand. I think that I screw up tipping timing...
I usually do split stay, without a car. So, I tip the 1st resort bell svs to take my bags out of the first room to move them to the 2nd resort, then tip bell services to bring my bags to the second resort room. And, I've tipped garden grocer online, who usually leaves my groceries with bell services. Then, I tip bell services again when they bring the groceries up!w
And I've been told $1 per bag, so with 3 pieces of luggage, laptop bag, and all the groceries, it gets pretty expensive.
Plus -- Garden grocer is making a profit on the groceries, they are elevated prices to begin with (at least it seems that way to me), but yep, I usually tip $10 - plus the $12 delivery fee, plus the elevated grocery prices.
I think we are going to rent a car just for those first couple nights this time, and I think between saving some money by grocery shopping ourselves and transporting our own stuff, and saving time just getting ourselves from one resort to the other via bus/DTD/new resort, and dropping the car off at Dolphin resort and walking over to Boardwalk, win-win I think anyhow

Sorry this got a little long winded!
-mary