They must improve retainer-market system before enable people to buy more retainer since right now, people complaining about market full and if they enable purchasing of retainer(s) I'm sure it will super full in just 1 hour after the release.

Let's see what SE/Yoshi-P will improve this system in 2.0 but I hope they will abolish retainer-market system and just let us sell directly into global market pool without visually placing retainer in market.