Amplifying Tome Buffs? Tome and 2 pots start?

20 AP - 435 gold 35 gold 5 gold!!! why not 435.7598 gold? 12 attack speed 300 gold boots 300 gold sword 350 gold potion - 50 gold

Cant we get this item for 400 gold? or 430 gold? Why not Tome and 2 health pots as starting option? I mean this item bugs me for very long time. It has really awkward price. If i buy this item i am left with 15 gold in the bank and i cannot buy anything