Sedo. On the namepros people mention that frequently. Is that one? I'm not sure about this field
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Depends on the amount of traffic that you get. If your keeping track of this, you should figure out if its worth getting into monetizing your domain. Because from there you'll be able to physically see if theres a decent demand for your site in terms of what others would possibly want to buy into.
But regardless, each of them have their ups and downs, so its worth looking into each of them and seeing whats beneficial for you
This is an age old questions that really has no correct answer. Some parking companies give drastically less overall then others (eg. GoDaddy) but in the end it comes down to individual portfolios and individual domains as some perform better at one registrar while a different domain will perform better at another. Try a few and play around until you find somewhere that you like and is making you good figures. Fabulous is definitely one of, if not the top parking company IMO. However you need to have a huge portfolio earning good figures for them to accept your application for a parking account.