Why would I pay three times more just because the other one is yellow.
Well, it implies that you are aware what the yellow multimeter and the infrastructure behind that color has to offer, and did your homework in analyzing which features and post-sales services YOU need, or probably NOT need and maybe never will need or use.
For home and hobby usage, buying a new Fluke or Keysight or Gossen probably is overkill, unless it is intended that the DMM has to last a guaranteed 20+ years.
For industrial use, where a yearly calabration is required, including guaranteed compatibilty with measuring accessoires, the calculation is different- here a certain brand may have some serious advantages in offering services like on-site-calibration of equiment to reduce downtimes.
So, you are correct with the "Why should _I_ spend that much money" - I asked myself the same question as I was looking for some DMM for my humble home lab, and decided against a new yellow DMM.
(okok, as I got some good deals on ebay, TEA began to settle in, and now I have 3 DMMs...)