There's bearings...and then there is bearings. One is not going to get good bearings in a 59 dollar spinning reel. Many high end reels do not have sealed bearings either. But they do have bearings that have been treated and will not rust. All of my reels are in the medium to medium-high category. All of them have rust proof bearings. Some are sealed dry...some have sealed oil filled beings...some are open oil bearings, and some are open dry bearings. Good bearings are not cheap. Here is some info if interested. You will also get varied opinions on bearings if they should be lightly lubed....oiled...or dry.
DAIWA Line Roller 2 Bearing upgrade Kit [RG] (For 17 THEORY, 16 EM MS, 15 LUVIAS, 14 CALDIA, 14 X FIRE, 14 EMERALDAS MX, 14 PRESSO)
Regards