they pay for the gap i pay less but receive less. if you move to subscription based you lose about half of your population immediately then have to pay an average equal to what all players spend on gold. say 1 guy spend 2000 euro per month on this game. his 2000 will be divided between players already paying. so in the end where most of us spend probably 9 +14 euro a month it may rise to say 50 dollar. and then it becomes too expensive for me.
and will one need to buy eb's then with game cash. your proposal needs a lot more work. and in the end is not reachable.
Yet massive gold introduction biased the game ; for example, none of the factory are profitable when you use employees now.
Yet infantry pack and exp.points exclusion biase the game as D1 and D2 players are often stronger than D3 and D4.
Yet EC gap biases the game as all the tournaments and events now are only reserved to gold buyers as consequence of this gap and the use of PP.