Do not sell or trade thanks. This includes not releasing a skin until a certain # of thanks, providing art or services in exchange for thanking posts, etc. That was not the intent of this system, so if you have skins you want to be explicitly rewarded for save them for contests.
People can still thank you before you release a skin, but please don't put price tags on art here.
Also do not create accounts just to thank posts. Accounts with an excessive number of thanks given will be compared to other accounts with the same IP address, so sorry if you were planning on getting your family of 10 to help you.