[CardinS2U]

For the hide-thank feature in addition to that I think you should add on to be able to see post if user pay money for that thread..

[hide-money="$20VND"] me me emme [/hide]

user pay 20 dollars and can see what in the box.

if next day post starter edit thread and put [hide-money="$24VND"] me me emme [/hide] then user have to pay again to see.

or pay diferent of 4 dollars depends on thread owner if he/she want to clear money.