They shouldn't. Why should they? Casue "it's hard to find them?" Not really if you know where to look. Had like 5 LPU4 albums through my hands the last couple of years, seen quite alot on ebay.
Thing with reissues is that once there is an album or two reissued, the "must have" value of the originals is decreasing. Like with HT on vinyl, it was such an item for many collectors until they decided to reissue it couple of times. Now it's available for like $20 or so? And the street value of the original first press HT increased BUT there is no demand in buying it for like $250-$300 (Well if you can have it for $20 reissued why buy the original with a 10x higher price right?) That said, it's a NO from me. They really shouldn't touch LPU albums.