It is just insane to try to justify your claims:
An A1000 was $1300 in 1985 and was the best and most modern technology when released, it was a full computer, The SAM, in 2009 is just a motherboard, and the rest, well you all know...

If you want to justify you payed too much for SAM, then do it just by saying: it is what i like, and i bought just for the expensive geekness it represents, or something along the lines, but please dont ever try to fool anyone over here by saying SAM is worth its $$$, because no, you cant.
If you want a new Amiga-like enviroment at a reasonable price you could:
-Buy a Pegasos and install AmigaOS4.1
-Buy a Macmini and install MorphOS 2.4
-Buy a PC and install AROS
But never dare to suggest a SAM is reasonable priced!