Sometimes my FI is so silly with what he thinks is required for a wedding...

We have had a great deal of difficulty choosing what we want to do for a wedding cake. We originally were going to have our caterer do it, but then finances got bad so we cancelled the caterer (and, therefore, the cake). So then we started shopping around for another option, FI's grandparents offered to give us $500 to pay for food and our wedding cake, and whatever is left over from that $500 is our wedding gift. We found the cheapest actual tiered wedding cake option that was available, at Walmart. FI's grandma is adamant that we get the bigger cake, one that can serve about 100 people, so we were gonna go with that for 150 bucks.
Well, today I was playing around online and found DIY how-tos for making some BEAUTIFUL cake stands. I looked everywhere for a platter that is big enough to hold the biggest bottom layer of the tiered cake, and couldn't find anything that I liked. So I thought, maybe I could see if it'd be cheaper to just get regular round cakes, and stagger them ourselves with my DIY cake stands? I called Sam's Club (whose cake I find to be MUCH better than Wal-Mart's, strangely enough considering they're owned by the same company) and they have 10" round cakes for 13 bucks each. Ding ding ding, we have a winner!! That would make our cake only cost us about 40 bucks, instead of 150. Can't beat that deal.
So when FI came home, I explained the idea, showed him my concept for the cake stands, and he seemed to like it. But then he spent the rest of the night whining that he wanted to have a "real" wedding cake. Silly me, I thought that a wedding cake was defined as cake that is served at a wedding, not by whether or not the layers were stacked on top of each other, lol! He eventually did agree that it's a better option, and I showed him lots of pictures of other real weddings that had their cakes set up like that. But he's still complaining a bit about it.
I guess I just don't understand, I would have been happy with a sheet cake from Costco to be honest, because I think their cake is divine. But god forbid we do something like that, or else our entire wedding would be invalid all because we got a cake that isn't a "real" wedding cake. lol