Multiple people think in the environment and act with responsibility toward current and next generations without proceeding with a potentially problematic footprint, but others don't. Some care more about their own money. The following words go for everyone, in terms of money investment.
Solar panels are reaching a lower price each year. There's a lot of competition and the materials to build solar panels are cheap. Now some places allow a more reasonable installation price per watt, so using a calculator it's only a matter of clicking some buttons to understand that in less than a 10 year period, the investment is successful. PV panels guarantee a long service.
Fuel? With an electric vehicle, there's the chance of charging it with solar panels during a studied period of the day. Now some vehicles are ready for mile ranges that are more than enough for everyday routines.
Having free energy, it's maybe a good excuse to use other useful devices as well.