Looking at their usage "graph" (if the relative visuals indicate actual percentages), it appears that IE overall is a very small percentage of their views - perhaps 3-5%. Within that small percentage, IE 8 makes up what appears to be around 20% of all IE users. So they are spending time to optimize for around 1% and maybe 2% of their total views.

I'd suggest that it probably isn't worth it to spend a significant amount of time to support an audience that small. To determine if this is true, the company should track conversions from those using the IE browsers. If they have an average or higher than average number of conversions, one could argue that it is worth the time spent.

Otherwise, you are probably wasting significant engineering and design resources to solve problems for laggards who probably won't give you any money.