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the ghost league will allow you to use max level cards unlike in the ranked league ghost cards, you can only use level 1. There should still be progression in this league to earn the max level ghost cards or other ghost cards on diff levels. This is the only way majority of players can experience the game to its fullest potential.

Ok, that's an interesting idea. And I think it would be beneficial for new players because the gameplay is more entertaining at higher levels and they can only experience the lower leagues in ranked battles and may think the game isn't fun at all.

This is going to be possible with the new open tournaments (although there is a 20SPS entry fee) https://splinterlands.com/?p=tournament&id=a9cceda6e3921f65baef72a14a9e66cd8d28c534

It doesn't allow you to experience climbing the leagues with the changes in abilities, though.

Yes correct!

It could if it used the same leagues and ranking system as the main game does though