Sydney footpaths aren't as wide as others, so there are very few places you can park without obstruction. Then if you do find a place, if it's inside the building line, the building manager comes and ticks you off, or tows the bike. To their credit, Sydney city have tried to cater for street parking, which is free, but usually a block or three from where you want to be, and a strong target for thieves. Some pubs and restaurants are happy for you to park there, because it attracts attention, but providing you don't face your pipe into their premises when you start up to leave... Yes, I've seen it....
Melbourne is the place to see bikes parked on the pathways, literally hundreds in a row, sometimes preventing people from crossing the street, but it's accepted practice.
I've got a free undercover spot at work, so I'm happy.
Mick