According to this website, there were 67,262 R34s produced. Now according to this website, there were 45,230 MKIV Supras made. So unless I am missing something, there were more R34s produced than there were Supras...
I do however agree with you on one point as I would much rather prefer a slow and steady appreciation than a fast and reckless one. We all know what happens when things sky rocket, take Bitcoin as a prime and recent example of this. Although, I have no doubt that it will yet again make higher highs, it has left a lot of people severely out of pocket. But as I said, the market will do what the market wants to do...