Both Path of Radiance and Radiant Dawn had very limited print runs and not much sales success, leading them to disappear from retailers quickly.
FE9 came out in one of the last years for the GameCube when the GBA Fire Emblems were only beginning to catch on and most people had only ever heard of the series via Marth and Roy in SSBM.
FE10 had several factors weighing against it: it was billed as a sequel to a game not widely played, it came out before Ike was well known via Brawl, it was released with basic NES-style controls (sideways Wiimote) in a busy launch year where public interest in the Wii revolved around games that pushed the system's unique control schemes (even for other ports of projects originally conceived for the GameCube, like Super Paper Mario). And even if you were one of the few people in the know who was already hooked on the series in the four short years since the localization of FE7, and had already cleared 7 through 9, Radiant Dawn was known in the community for two things: being incredibly hard next to its predecessors, and allegedly watering down the support conversation system.
I don't wish for remakes or remasters often, but I hope the Radiant games get a new lease on life, possibly as a bundle together. These days you can't sell a Fire Emblem game without a Casual Mode, but that's not a problem; it doesn't affect us Classic-only players anyway. And interest in these games has grown enormously in the years from Brawl to Awakening.
