Crafting ingredients mostly. Mining and hunting pelts? Dragging empty soul gems around and casting soul trap at each fight? Only using alchemy ingredients you harvest yourself? Pfft, who has the time and patience for that! Ever since the Legendary patch, suddenly I buy a lot more crafting materials than I used to. I won't use exploits or glitches and find crafting slightly more interesting than spamming spells like detect life or harmony, so crafting is a good way for me to get more precious level ups and perk points.
Also on building homesteads. Building a homestead between levels 10-20 is a real money drainer.
And food as I made a roleplay rule that I have to make provisions for any family, housecarls, servants and animals I acquire.