By not trying to window-shop? Aka, posting wishes disguised as suggestions.

My all time favorite- asking for a feature that is already existing, not taking time to search the documentation, then when somebody duplicates the information for you (basically becoming your free of charge search engine) - you dont thank him, but ask for a implementation (basically hiring a programmer for free)- once that doesent happen, you are never heard of again.

And that above is the norm in Open source community. Those hostility arise, because there is a constant stream of clueless users doing the crybaby on forums. Which is why man open source devs retreat to irc and only answer your question if you lurk for a day and post a little history detailing your own investment.