I don't know when the trend of asking people to high school dances in extravagant ways began, but it made for what was easily one of my fondest memories from high school. It didn't matter if it was me, one of my friends, or somebody I didn't know- I loved watching the creative ways people would get asked to go to dances.
The trend I noticed every year around prom season was that although the asking started getting more creative, there were also many people who started to get more reluctant to make it a whole production. I would constantly hear things like, "promposals are a waste of time and energy" or that "there's no point." Who cares? As a high schooler, there's "no point" to half the things you do, so why not participate in a tradition around high schools nationwide?
As someone who was asked to dances in a number of different ways in high school, I can honestly say that nobody will care if the idea is the most creative thought you've ever had or if it's a totally unoriginal idea. All we really care about is the effort that you put in because it makes us feel good. It's also pretty fun when a lot of people see because it makes us feel relevant. For a short time after that, we are known as "the person who got asked to prom at the pool" or whatever it may be. Yes, the reasons are almost completely selfish. What's the harm in helping somebody indulge in a little selfishness as long as it doesn't hurt anybody?
If you're in high school and you ever think you're "too cool" for promposals or you think they're "a pointless waste of time," you should stop and think about how happy it might make the person you're asking. Who knows, it might even heighten your chances of them saying yes.