The main motive for collecting remains the fascination with the object; value preservation is mostly only a welcome side effect. A central list of realised sale prices does not exist, since alongside condition the renown of the seller also has influence. Value-influencing are in particular the serial numbers: in the Asian market, lucky numbers like 3 or 8 are particularly sought-after, as are pre-series prototypes with the number 000, which are difficult to obtain and accordingly achieve high sums. Supply and demand remain the essential value drivers.