indeed collecting is a funny old market.. some things are worth far more to some people than others. Welshy, with 2 (or is it 3?) Lazers probably won't value this kit as highly as others who haven't got one and really really want one!!
Good luck to Tjompa.. you sold the right car at the right price and fair play to you sir! If you can't make an honest buck what can you do?!!
p.s. I have a Lazer ZX-S too... and 2 ZX-Rs...