The issue I have with comparing lightsabers to other equipment is that most equipment is a commodity. A character can pay someone else to mod their other equipment or buy it already modded. I don't think there should be any lightsaber stores or repair shops. With the high XP cost of managing your actual Jedi talents and powers, it means the majority of Jedi are unlikely to develop their mechanic skills to 'level-up' their base saber to match the one listed in EOE.
I understand the devs desire to create another layer of play (a crafting mini-game) to add depth for characters, but I won't use it as a significant part in my games. I'll probably do something more abstract like provide padawans with base 6dmg sabers, knights 8dmg sabers, and masters 10dmg sabers with the narrative explanation that improving their blades was part of their trials and was done with guidance from their betters. Then different crystals are availble as a base and mainly for color choice or other factors (burn, viscous, disorient, ect..).