The fact of the matter is, they are! And for most of the expansions that have done a great job to prevent hyperinflation. In the real world governments can help reduce inflation by increasing spending or taxation. Blizzard is a bit handcuffed in that sense, they are not direct participants in the economy of WOW GOLD so can not increase their spending and do not currently tax players (with the exception of the WOW GOLD auction house.)
So rather than find ways to increase player secretly spending right before the enlargement. This helps to reduce the supply of money in preparation for expansion. Implementing changes to the players "want to" go wow gold. Ex madness 4.0.1 glyph, so angry PvP requires no qualification requirement.Introduction expensive and desirable items. Gigantique bag Ex. 3.0.1 (cost 1200 wow gold, a huge sum at that time), late expansion vanity petsIn this way Blizzard is able to reduce the money supply in general and create a favorable business environment for natural growth to occur in the expansion.
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