My collection has not gone past four Kanayama's. I don't include a #50000 I gave to my son, as he is now getting into straight razor shaving aged 26. So I think four is the line of demarcation. Any more than four and even I can see my mania is in action. I also don't regret owning any of them, some people love old clocks, Faberge and some collect stamps. I'll wager my four strops don't cost near as much as a Faberge Clock!