I wouldn't say it's a bad thing. I don't think it's more or less selfish than other climate aware choices like driving a reasonably efficient car into the ground, driving less overall, producing less waste, etc....

Everything you spend money on is what you personally want to see more of in society (because at the very least you want to have it yourself). I don't think it's virtuous to buy into immature technologies per se. I'm just happy there are people right now who are doing it for EVs as early adopters because it means more investment into electric transportation technology.

One day you may buy an electric car, or use electric transportation as your main mode of transport because it will be a mature technology that meets your needs. If you do, it'll be in part thanks to early adopters paying a relative premium at time.