Who knows is my answer. As you know I'm into auld Triumphs and the prices of those are exhorbitant, even the wee 200cc Tiger Cubs are well over a grand.
Look at the prices of xs250s nowadays, they are the Yam equivalent to grey porridge, as Cubs and the like were called. Look at xs1100s
Heres my tale of woe
1980 xs250 bought 1981 for £625 sold 1984 for £125 selling now for £500 upwards
1978 cb400/4 " 1981 for £180 sold 1983 for £400 selling now for well over £800
1980 T140D " 1983 for £1100 stolen 1989 Ins paid £1600 now selling for over £5k
1955 Speedtwin " 1985 for £110 sold 1988 for £250, selling now for well over £5k
1979 xs1100 " 1990 for £380 sold 2001 for £850 selling now for £2500 -£3500
So as I say who knows, the prices of aulder Japs are climbing up and up so in maybe 20 years....
edit//: Just looked on fleabay 3 xs11s at a grand and under and 2 at £3999, although whether they sell at that we'll probably never know