I think the main reason is that VASSAL-VASL (https://vasl.info/ https://vasl.info/) has 90% of the features of a video game and is free. It has all the counters

I think the main reason is that VASSAL-VASL (https://vasl.info/ https://vasl.info/) has 90% of the features of a video game and is free. It has all the counters, maps, charts and guides -all that is missing is the rules and the scenario cards. MMP sells a searchable pdf version of the rules for cheap online and the vast majority of players are happy to share scenario cards if their opponent doesn't have it.