el3n1: To me, that does seem to have a negative effect and outcome on the game and if the problem grows and gets progressively worse it can undermine the viability of the game overall. However, I doubt that ready go's alone are where WGT is making their most profit so it may be negligible other than our perceptions and how we feel about the game. It still seems problematic!
This is probably the most quiet time on the multiaccounting front since the credit games began. It used to be MUCH worse. Before the fall of 2012, when WGT started to disregard the "minimum required rounds" to tier up for those, who were winning RGs and MPs against higher tiers (so called anti-bagging system), multis were basically top 5 (or 10) of every lower tier RG. And they took their time, cause they had over 150 rounds to play, before they reached legend tier (the highest tier back then). That meant a ton of earning potential. The thing was rampant, a guy from Indonesia had 2 CCs filled with his accounts, over 60 of them, lol.
After the change, the number of multis started to drop off, until the brackets came and the Legend 500 cr brackets became the honey hole. Apparently they're no longer available, probably why there are so few around now.
As for WGT losing on account of multis. Well, yes and no.
By winning many credits, multis don't put any money into the game, but they also prevent "honest" players from winning enough, to stay afloat. which then forces them to either buy credits or do offers, WGT profits from both.
But WGT loses money, when the multis, who are winning big, start selling their credits at a discounted rate (paypal and forfeited blitz challenges) to people, who would normally buy them directly from WGT.