I think there are some main differences here between Shop at Bid and Ideal World.
1) The quality of the products. A lot of the brands at Ideal World are long established and some of it is very well known. Bid are relying much on generic items and 'brands' no-one has heard of.
2) Because of the general low quality of the goods, the presenters at Bid have to rely on incredible amounts of hyperbole to sell their sh*t. Ideal World presenters come across as far more knowledgeable an d professional in their presentations.
3) Ideal World have maintained a sense of trustworthiness by engaging with their customers. Shop at Bid's approach is to rip buyers off with cheap crap with huge mark-ups, a dreadful record of poor compliance with the ASA, extortionate postage and package charges but with the worst delivery schedules out of all the shopping channels.
I don't think it will be long, if it hasn't already happened, that many people will be turned off Shop at Bid much quicker when they can now easily see the comparison between this channel and the others.