I also tip daily, I think it is the fairest way because you do not alway have the same mousekeeper. If you tip weekly and your regular mousekeeper is off that day the replacement gets everything. We usually tip $1 to $2 per person.
There are two or three of us, I tip $5 per day, and another $2 per evening for turn-down service.
At DVC resorts I leave $5 for trash and towel, and $10 on full housekeeping day for a 1BR, I still leave $5 for T&T and $15 for full cleaning for a 2BR.