It would depend who it was and what they were doing.
I don't see the need to tip for normal expected service.
I have no problem in tipping someone for extra-special service though less business or tradespeople but more waitresses, taxi drivers etc... and if I did tip tradespeople if would be more likely to be a bottle of something or similar.
I do like to see tipping as a reward for great service and don't think it should be expected, my view would just be to put the prices up and pay staff more.
I recently went to New York where tipping is expected for so many things, dollar a drink in a bar, service on eating out, always in a taxi and if anyone in a hotel moves your bags etc...
It's a bit in your face, I'm not mean by any means but if you don't realise, forget, or don't given enough, it's pointed out to you, usually quite abruptly which I find quite rude.
You do get used to adding the extras on though almost like part of the price.