10.0 was effectively a beta OS, which was probably why Apple felt compelled at that time to offer the 10.1 update for as close to free as they could to those wh

10.0 was effectively a beta OS, which was probably why Apple felt compelled at that time to offer the 10.1 update for as close to free as they could to those who had suffered through the developer previews. 10.1 still had plenty of issues too. IIRC the next paid upgrade 10.2 was the more typical for the period 129 dollars. I was in a line of three people at my local Apple store for the free disc back in 2001.