At least comebacks are possible in Dota due to how items scale. In LoL, the better the item, the more cost effective it is. In Dota, good items are often overpriced compared to lower tier items with comparable stats (though they have other advantages, like active abilities or requiring less slots to equip; sure you can buy three iron branches that basically give you +3 to all stats as opposed to buying an item with almost the same gold amount that only gives you +3 to one stat, but it is only one slot as opposed to three).