I'm not sure paint color denotes quality in any way, but it does look more uniform, if you like that type of thing.
Although the oops paint is one possibility, there are many other reasons. There are some beekeepers who believe it's easier for the bees to locate their hive in a busy apiary if there are different colors of hives. I'm skeptical of that personally. Some people do like to have colorful hives and even paint little flowers and things on them. You may see Langstroth hives that are different colors in the same "stack". Langstroth's are modular and you typically add and remove components throughout the year. It could be that the beekeeper wanted mixed colors or it could be that they had started with different color full hives but necessity required that they use what was available and it was a different color than the other parts on that hive.
Beekeepers can be an eclectic bunch. Around our parts you get the uniformity of CloverKnoll, to tie die hippies with their bold colors with randomly distributed hives, and everywhere in between. There are as many ways and methods to keep bees as there are beekeepers. A lot of them will tell you the way they do it, or the equipment they use, is the best. They are right, and they are wrong. They have determined it's the best way for them, but it may not be the best way for you. Also, hive management styles typically change over time, as you try new things or as you notice how the bees react to your methods.
I like that so many people are getting education and enjoyment. More bees is more better.
