I think it would be a really good idea if we could search by broker. I do hate it when traders hide their broker, as there is no advantage to this. I mean, if I use a reputable broker, why should I hide it? The only people who want to hide the broker they are using are those people who have something to hide. If you use Oanda, FxPro, etc then you have no reason why you should hide it. If you use an unknown or unreliable broker than of course you don't want to spread the word.

So, in my opinion, brokers should always be shown without any option and we should also be enabled to search by broker.
"He who dares, wins!"