Thanks all for the reply.

I do get paid a PerDiem, but it is just enough to cover my food expenses. I do like to have at least one good meal a day (usually for dinner) and that alone costs me anywhere from 18-30 (without drinks). What I meant to say was that I cannot claim gratuity as a separate line item so it has to come from my pocket.

This is what I was tipping so far

[1] $10-15 per week depending on the loose bills I have. I am planning to cap it at $10 a week.
[2] Shine $2 if I pick up and $5 if delivered to room. Based on input - $2 if delivered to room
[3] $1 a day for housekeeping. This I am planning to continue.
[4] I was paying a $4-$5 tip on top of 20% room service. I am going to stop this.

Considering that I order room service twice a week, that should save me a minimum $10-$15 a week.

Thanks again for everyone's input.