How are sinks and lights similar?

In addition to remodeling the kitchen, we have also been working on the front and back of the house. We are looking into putting quartz in as countertops in the kitchen. We wanted to put in an undermount sink so it wouldn't have any edges. So, we went to a couple places to price them and were surprised at how expensive they are. We know the price of steel has gone up dramatically, but it was still pretty spendy. So...we went to good 'ol Home Depot and looked at their kitchen sinks. They had drop in ones that we liked for $109. Not bad at all, but they were drop in, so we asked about special ordering an under mount. Get this...the exact same sink for the undermount (using less steel, of course) is 3 times as much. Doesn't make sense.

Then today...we needed to find lights for some pillars that we are having built in the front yard along the stairs. We need about 6 lights in all, so we went to Lamps Plus because our contractor has a discount there. Carriage lights for the side of the garage doors were not bad, $70-$90 for the ones we liked. Then we looked at the lights for on top of the pillars. Same style light, just for a post instead of mounting on the side of the wall costs again, 3 times as much. I'm tempted to hang the lights on the side of the columns rather than post mounting them on top. :)

I have come to this conclusion: (I may not like it, but it is a conclusion, none the less) Undermount sinks (the more expensive kind) are usually used with granite, corian, or quartz countertops. The more expensive countertops. You've already paid a lot for your countertops, why not spend a little more on your sink? Same goes with the outdoor lighting. Everyone has lights on the sides of their garage doors, but not everyone pays to have stone walls put in with columns, etc. You already paid for the stone wall, why not dish out a ton more for the lights to go on top of the columns?

Craziness or maybe it's just reality.