Does pressing the support button cost us anything to give the others support (e.g. deduct our gold)?
Do we get any point for doing so?

no, the heart button cost nothing but

can give other gold and so on

eg

5 hearts = 5 gold

the point is some member doesn't want reply thread but they want to say thanks to the author, so.. just simple press heart button to say thanks, author can get gold, that's where the idea from.:s_8: