Apart from the Kaleidescope Parasol, the other equipment on the Level 50 Stolord was very ordinary. Because he didn't have a class, he couldn't wear class-specific sets, so he simply switched equipment whenever he found it convenient to. Ye Xiu had more than enough money to buy these common equipment.
As a result, he had equipment of all different kinds and of all different levels. This was what other experienced players did as well though. Before reaching max level, very few players cared to buy the best equipment for themselves. The reason the top guilds would do this was because one, they needed the best conditions for challenging the dungeon records and two, they had many players and plenty of resources. Most of the resources didn't need to be spent on the majority of the guild members, so the guild could allocate a bit of it to buy the most optimal equipment for their elites.