Thats how we greet our loved ones, as well as friends:-)
I dont really like it, one good kiss should be enough i think, but hey its custom so...
Hospitality is were the "brabander" is famous for. There is an expression: eenbrabants kwartiertje, meaning people dont always care about time so sometimes "brabantse nachten zijn lang", meaning it can get late when visiting here:-)
Dutch don't usually give tips unless they feel the service was exellent. I always kinda felt bad about it everytime..but nobody seemed to take offence..
I'm usually a big tipper, but has Pierre_Rousseau says on his page:' In Rome, like the romans'