This has been intensely discussed on other boards (RADP) with regard to resort stays where the maid service is daily. Tipping $2 a day seems okay if they come every day- if they don't come everyday, why are they being tipped by the day? Another confounding factor is that "officially" housekeeping is NOT a tipped position according to Disney. They encourage you to tip valets, bellhops, but not housekeeping. Someone says any tips you give housekeeping are collected and given to management to dispose of as they see fit. Some say for a department party or charitable donation. I have no idea if this is true, but someone once posted the WDW policy on this issue and it was that housekeeping is NOT a tipped position.
Paul