The point is however that this pair in cabs is exactly what a number of buyers are seeking.

This is reflected in the price that will be paid. If the bidding field is wide, ie worldwide, then the worldwide market sets the price, irrespective of it being one or five individuals.

A pair of 604 in 605A cabs sold for $14,100 in June this year.
A pair of mint Bs, no XO, went for $8,000 in May.

Yes you can buy single Bs for less, still the going price for a good pair is still in the $4,000-5,000 range. This is a complete package.

When you consider mint 288 RWB pairs go for $6,000-8,000, or mint WE555s go for $13,000, and yet you only have half a system.

Nipper IS correct, value of these older units will increase, as they become rarer and rarer.

I've been tracking Altec prices now for 4 years. Values ARE increasing.