RC4WD I never learn

[Rimrock]

I can't figure it out, what is it about RC4WD and hydraulic nipples...Are they made of silver..? E.g a straight M5x6 nipple; $25 ('retail 29.99 !) Same size nipples at Premacon (which do not sell cheap stuff in general at all); $2-2.5 . So we're talking 1000% higher at Rc4WD... And what about 'Get them while they last - no longer being made' )) It's a standard size nipple, been made for years, and will be made for many years, as long as there are RC hydraulic equipment out there.
http://store.rc4wd.com/Hydraulic-Con...on_p_1818.html
http://shop.premacon.com/product_inf...products_id=72