ChargePoint is building an asset-light EV charging business, but that doesn't mean investors shouldn't worry about the model. ChargePoint (CHPT 7.32%) is a key player in the electric vehicle (EV) market, but it doesn't make vehicles. It makes charging stations, which is more of a picks-and-shovels play in the EV space. The only problem is that so far, ChargePoint hasn't found a way to sell the vital products and services it provides profitably. Here's why the company's asset-light business isn't working out ...