Originally Posted by
Lent Well, there is the odd warning that you can't give rep to a person again after you've just repped him/her. (Make sure to spread some rep before you can rep the same person again, something like that). That also works (at least at times) in combination with thanks and reps. It doesn't always work with only thanks, as far as I know. To my knowledge it is possible to thank the same person more than five times in a row, exact numbers I'm not sure of.
There's a lot of quick and fun contest threads where people would likely use that option to thank this person for his/her witty answer, then the next person would thank the person back and so and so on. So having such a feature in the contest section I personally wouldn't like to see. About the shop section, well, I'm not too sure.
I just think that the thanks option works best for the downloads and help section and less for shop threads. :)