Thanks for the reply,
I totally agree with the fact that prices should reflect real supply and demand, that's why I asked the question if it wouldn't make more sense if NPC prices would also take the 'market'-prices into account (as part of a formula) to calculate prices for a day (or week or whatever timeframe is chosen), maybe this would lead towards a game in where the making/crafting/potioning etcetc of items are worthwhile again (instead of reading a 'big book of....').
I do think that should be possible (the 'big book of...'-part) but I somehow I think the original idea for leveling (making items) in a skill is somehow bypassed in the last years.
btw, I don't think the lifting of having alts is, or should be, a valid answer, it just means there is a work-around available. ;-)