In order to match the growing of our heroes, it’s necessary the troops are that expensive. Having maxed troops is something to be achieved endgame, not quickly - things that we got too easily tend to be undervalued. As in other facets of the game, patience is the key word.
In the recent discussion with the lead developer, he mentioned that training troops will be possible in the current design of the “Advanced Training Camp” coming up in the Stronghold Upgrade in the next six months. I hope that these options for troop training include the equivalent of “legendary” training with a chance of getting 4* troops.