My new 04 kx500 came with a black tank, I could not tell easily how much fuel was in it unless it was in direct sunlight. Then when refueling, I had a difficult time knowing when to stop and regularly overfilled it, making a mess.
Then I bought what I thought was a butt ugly, nasty looking, terrible color natural color tank. Wow ! I now could tell how much fuel I had while riding. I also could tell when to slow down when refueling. I realized that the nasty color tank was a very user friendly tank and after a number of years have grown to look beyond the crappy color and be greatful for its ease of use.
John