SRAM X7 10-Speed Rear Derailleur – why the cheap pulley bearings?

Subject says it all really.
Why do SRAM spoil a competent rear mech. with cheap and nasty bearings which go rusty if they are in the same room as a drop of water?
SRAM ought to expect bike components to get wet from time to time, I’ve had the rear mech about a month.

20150515_SRAM_cheap_bearings

(31/8/2015) By way of an update, SRAM do say you can dismantle the jockey wheels, remove the black seal and add grease. It’s a lot of faffing around compared to using better-sealed bearings in the first place.

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