There are several solutions available for the unattractive factory calipers. You have to keep in mind that there are Elitists, Enthusiasts, and "Average Joe's" in the retail market and each will lean towards what fits them the best.
Personally, I consider myself an enthusiast. In fact, I just finished a budget stroker motor install on my project BMW E30 and went with a BBK up front. I went with a BBK because I needed it. I run a rear caliper cover set with a custom engraving to personalize my build.
For the most part, the Average Joe is not looking for a BBK. Especially with the price tag and all that is involved. Sometimes people forget that they may have to buy different wheels to make room for the BBK. On top of that, possibly new tires. A BBK starts off as an expensive modification and can get even more expensive, real quick.
Caliper painting. While this is a good bang for you buck modification, not everyone is willing to spend the time and effort involved. Plus, some calipers just look terrible. So now you're just making the ugly caliper red. Have you seen the calipers on some of the Audi's that have been on the road for a year? I sure would not want to tackle that rust job! It is a valid solution, but it's not for everyone.
Powder coating. If you are willing to deal with the price tag and down time, I prefer this solution over caliper painting. It will hold up better and longer. It's not as cost effective as caliper paint, but in general should hold up much better. The down time and price tag is usually the deal breaker for the "Average Joe".
Caliper Covers. IMO, this is the solution for the "Average Joe". One hour down time. Install and go. You're done. People seem to enjoy the reduced brake dust and simplicity of the installation. Options such as custom colors and custom engravings are nice selling points as well. MGP Caliper Covers offer a 3 year warranty on the powder coated finish. What's the warranty on caliper paint? (Not being smart, I really do not know)
As much as I enjoy being an enthusiast and doing major
mods on most of my projects, I do understand that the majority of the
aftermarket is with the "Average Joe's". Don't get me wrong, MGP Caliper Covers are not ONLY for the "Average Joe". MGP had over 100 vehicles sporting caliper covers at the 2011 SEMA Show. If you ever been to SEMA, you know the cars there are far from average.
I would be more than happy to answer any questions, or just expand on the discussion more. I know some have already made up their minds, and that's fine. My hopes is to clarify the options a little better to other shopping for their solution.
Thank you.