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Joined: Aug 2007
Staff roles: Story Dev Economy Dev
Generally speaking, it's fairly risky to give people access who you don't know or trust. There are various exploits that people can use to wreck your supplies if you're not careful.
Most bases also try to make money out of selling docking permits, which in turn can give access to ore reserves or other valuable stuff. Sometimes the owners want to keep the stuff they're stocking private for their own group/faction.
Plenty of reasons. Anything that's sold on a station has to be put there by another player after all - for the station owners, that's not very profitable.