You're telling on yourself.

Most people I know are happy to leave a tip - especially to reward great service as part of a great night, or in cases where you have a long term relationship with an establishment and its staff.

I can only imagine the staff is likewise happy to see the nice tip from us at the end of the night.

If you can only imagine "unnecessary bad feelings" - I can only imagine the tip you leave and how the staff feels about you. If you are so poor, you won't enjoy the price hike either and if you are not poor then just tip properly and move on.