What are the pitfalls of PTC sites

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I've just begun my PTC/PTS site (see my profile if interested). I'd like to hear from others who have run their own operations and what pitfalls you have seen. I'd rather learn from your wisdom then to make the same mistakes myself. I think I have developed a site with a definite niche market. Now the job is to work it to its fullest potential. All suggestions/reviews are welcome.