It was removed to allow flexibility for members to sell items that were worth more than RRP. It was too restrictive, but the downside obviously, is hot ticket hardware releases such as now.
Lots of proposals have been raised over the years and most are unworkable.
Scalping, or more properly, profiteering, will always be the unpalatable side of classifieds trading, and restricting the practice would not solve the issue of those who are after a system and can't get one. The profiteers/bots will still buy up all the systems - they'll just sell them elsewhere. By indulging the minority who simply dislike the practice on principle, the only people who would genuinely be affected by this are those who ARE prepared to pay the inflated price, and there are plenty who will as evidenced in the classifieds.
The simple fact is, if you don't like profiteering/profiteers, ignore it/them and move on. I want a 3080/90 and can't get one. There are a few for sale in the classifieds at inflated prices, but I'm not going to stand here and rail against them for my not being able to get one. They had the foresight to purchase or pre-purchase one or many, and I didn't. It's as simple as that. If they can get the inflated price, good luck to them, but I won't be paying it and nor will I complain.
Also, it's probably worth mentioning that this situation is almost unique in that 2 major consoles have been released alongside Nvidia's new GPU's (and AMD's Ryzen CPU's) - just before Christmas. The chronic shortages we're currently experiencing will probably not be seen again for another decade, at least, and it can be no coincidence that it's only now, that the complaining about profiteering has reared its head. Why does no one complain about watches/trainers/media/collectables etc being sold over RRP?
The reason I ask is that choosing a hugely in-demand item that cannot be purchased due to chronic stock shortages, just smacks of selective criticism.
Apologies if that sounds ranty, I get fed up of answering the question