That's so true. I'm fairly young, 30, but I'm buying one good conifer a year. I figure it's best to buy the best you can afford. Imagine what a 30 to 50 year old tree will look like in another 30 years. I am growing seedlings though, but only Deciduous (Tridents and Japanese Maples). I enjoy growing them, and it's hard to find good maple stock for bonsai. More so for Japanese Maples than Tridents. One can find tons of good Tridents, but fewer Japanese Maples for some reason.
Good for you, that sounds like a smart idea !
keep it green,
Harry