I recently purchased a scrupt called Viserlance from the Viserlab company and paid for 1 full year of support!
Turns out the script is full of bugs and the developer wanted to charge me thousands of dollars to fix them!
I complained to Themeforest, which simply took away the support I paid (something around $130) and also removed the negative review I did against the script!
This is going against the consumer code, by Themeforest company!