Good point on the option of getting large amounts of practice with a cheaper rifle to shoot, then you just need to learn the differences with your hunting rifle and load at different ranges, rather than do all your practice on basic position and other skills at $30/box or worse.
Then there is the other side to reloading, which I'm sure is part of the fun that will completely addict me when I have the opportunity to take it up.
The urge to consantly tinker and adjust the load to see what else the rifle may like, "maybe this powder will give me an extra 100 fps", or "what I've been reading about that bullet's performance on moose has me really interested in seeing how it groups in my rifle".
I've seen reloaders that work up one really good load and just shoot lots of it, and I've seen others that can't resist the fun of trying new things in it. So just because a particular shooter/reloader may shoot a huge number of rounds in a season, it doesn't mean it was all learning the specific trajectory of his final load.
I recall seeing one hunter (who really impresses me with his skills and ethics) not finish working up a load until the night before he left hunting - and I'm 100% confident that he made a good clean kill on his animal.
Reloading is just another addiction in our hobby, and I certainly am not going to generalize that "most reloaders are like this" or "don't do this". Generalizations tend to be very unproductive, and I try to avoid them.
Of course "Generalizations tend to be very unproductive" is a generalization itself! LOL
Have fun, reload or don't, but be as fair and humane to your game animal as possible.