This has to be one of the most idiotic ideas I’ve ever seen.
The entire point of gold existing is so that it can be used to purchase items and services. Look, the simple reality is that you will never get rid of boosting. There’s a market for it, and as long as that market exists, the supply will exist. The only way to mitigate it is to restrict how it can be advertised, and Blizzard is doing what they can to address this, with the most recent change being restricting group creations to level 60 players only.
Will that fix the problem? Probably not, but it will put a dent in it. No more level 1 spam characters making groups anymore.