In order to reap or sow, Chiefdelphi needs to exist and regularly contributing to its operations is important. Donations can be at this page...
http://www.chiefdelphi.com/forums/advertisers.php?
Beyond that, try to make your posts constructive. They should add to the base of knowledge already present on these forums. Well constructed questions and answers bring value to the readers. Unsupported or repetitive statements detract from the value.
When you post on CD, review your post before you hit submit. Check your spelling and grammar, ask yourself if you are adding to the discussion before you submit. It will go along way towards maintaining your credibility and improving your reputation. There are some posters on CD that I will read everyone of their posts because I know they very likely contain something I need to know or think about, and that is because of their reputation from past postings.
Finally, I like to have CD-SPY running in a separate tab to keep an eye out for an interesting thread or response to a posts, it also keeps you logged in when you are taking a long time reading a thread.
How to run CD-SPY
How to Preview your post before you submit it
How to Edit post (like I am doing right now)
