Perhaps it should be pointed out to the devs exactly what page in the dungeon masters guide magical item creation is located (128-129), because they seem to think they're so common and so easy to make that enchanters would not only name these items frivolously, but invest the time, resources, and money into creating set items for very low level adventurers, and then losing them.
They don't care who they make them for - they care how much they pay. You get some spoiled brat noble who wants to go waste his family's money going out adventuring and paying for a +5 set of blank of invisibility - they will do it if the little brat can pay for it. Hopefully he is smart enough to not get killed by goblins wearing +5 armor.
