Short answer is that yes it's expensive, but it will grow you faster earlier in the game
There are loads of in depth studies and guides that people have put together for the different types of jump, but the general consensus is this
Happy jump (5EDVD+ Ecstacy) is better until you reach between 300k-400k stats
Happy jump (5EDVD+ Ecstasy) is better for upto 800k in each stat if you are in a 10* AN and getting double happy per EDVD
After that generally standard xanax training and using natural E is better
But do what you can afford becuase as you say, it becomes very expensive
Full guide here:
https://www.torn.com/forums.php#/p=threads&f=61&t=16189469Also visual illustration in general terms (varies on gym type etc) of when which becomes more effective:
[image: i.imgur.com]