nothing will ever stop it, it will always be a part of mmorpg's ... & even *some* like EQ2 has taken the "if you cant beat em, join em" approach by releasing a server a while back which allowed players to trade in-game items for real money.
The biggest loop hole that faces mmorpgs in this type of buisness is the word "time"
DAoC (& many other mmorpgs) have tried all sorts to combat this.. such as in the T&C's it says summit like "All items are owned by GoA bla bla bla..." However the loop-hole is these people (& in some cases buisnesses) are offering to sell there *time* Even though these websites have "buy 10plat for £5" etc.. it will also say somewhere "by paying for our services you are paying for our time only" ...this is where they have mmorpgs around the dogs dangly's as they say.
As for GoA/Mythic deleting accounts that are cought.. yup it will/might stop the small geezer ..but many of these PL'ers are companys who have many accounts....chances are they transfer all plat/items to another account..Have other account(s) for the actual PL'n & then other accounts (even trial accounts) for the transfers to the customer. so in the scenerio one of there accounts gets banned, all they have lost is the trading account or PL account, whatever it is, they are a PL'n service, how long you think it would take for them to knock up another account with L50's!?
tbh PL'n/plat services dont bother me in DAoC as its mainly a PvP game so it dont effect me...however on EQ2 which is based on PvE ...having companys that constantly farm 24/7 *uber* drops stopping others from getting them would p!ss me off.
However paying for a PL on a game such as EQ2 (or any thats based on PvE) is a ittle backwards.. why would you want to pay for a PL on a PvE game your paying monthly for to build up your char.... the fun with PvE games is exploring/meeting ppl/XP'n etc..
In DAoC i can understand as most people just want 50 asap so they begin to enjoy the game in RvR... Lets face it.. PvE in daoc is as dull as it gets. (kill xxx of the same mob) ..very exciting!! so i understand why ppl do use a PL service.... dont bother me as said earlier, also the fact ive PL'd a few of mine own chars at 4fins (way before ToA & fops/shrooms etc) as im sure many people have done. But i wouldnt pay for it... cuz im skint tbh