Time and again someone in the know (usually Ryan Dancey) points out that WOTC/D&D for all intents and purposes is the only significant company in RPGs, that it more or less is the RPG industry, which means that except in RPG industry terms, White Wolf is probably absolutely tiny.I'm not sure that this is actually true. Many RPG companies only make RPGs, or make them as their primary business. I think. White Wolf have published one or two card games, but their house is built on RPGs. Eden does only RPGs. Mongoose, Paizo, probably a lot more. Outside of the d20 world I'd bet most companies only do RPGs because it's all the have capital (if not interest and expertise) to do.
It seems likely to me that Magic: The Gathering has made more money since it's release than the entire RPG industry has in 30 years. I may be wrong, but there's a long way between selling the odd RPG book and the licence to print money that M:tG appears to have been. Remember, M:tG and Pokemon CCG effectively bought D&D, not the other way around.