The thing to remember about HOTU is that it is generous with the money. You will have a lot of gold pieces and not lots of things you need to spend it on, especially if you imported a character with lots of loot in magic bags and recovered that stuff (to then sell). You will have an opportunity in the end game to spend some big bucks to effect plot outcomes with multiple characters, but it is not absolutely necessary, except for one case. I will leave it at this somewhat cryptic statement so as not to spoil you for plot elements later in HOTU.
The magical weapon upgrades (+1 up to +10 enhancement, keen, permanent haste, true seeing, regeneration, elemental damage etc) are definitely worth the money. In one of the sub-dungeon areas with lots of undead there is even an opportunity to add strength drain. If you have a weapon that is already enchanted, there is a limit to how many upgrades that you will be able to add in addition, but there is a way around that too. It is an exploit, though, which may or may not matter to you. You have the potential to build/upgrade a really over-powered super weapon if you have the gold pieces and the inclination.
Other than weapon upgrades and the above mentioned purchases to effect plot/dialogue choices, there really isn't much to spend money on other than ammo for any ranged weapons you may have or potions, and you will probably find most of the potions you need on corpses or in chests etc. There probably will also be the occasional magic ring, amulet, pair of bracers etc that will meet some need or vulnerability of your particular character, but really you will likely have lots of money left over at the end of HOTU.
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