A house does depreciate in value, but the land doesn't. I see you're from Australia so the tax system and valuation of things might be a little different there, this varies by country.
A little known fact is that most big commercial properties in the US are never sold. They are exchanged. Person A has a strip mall worth $3,000,000 and person B has a strip mall worth $3,000,000 after 39 years the building value drops to $0. For those 39 years the property owners get a deduction because there property depreciated in value, once those 39 years are up they know longer have that deduction and start paying higher taxes on the property income because they aren't taking a loss anymore on the building. What ends up happening is person A and B switch equal valued properties and the 39 year process starts again. They don't have to pay taxes as if they were buying it because it was an exchange and the 39 year depreciation cycle starts all over again. If I didn't explain this correctly here is a page that also explains property depreciation this also is the same for houses but the depreciation cycle is shorter
http://www.invest-2win.com/depreciation.html
Just remember I'm not saying the property resell value goes down at all, it could actually increase and almost always does especially in that long period of time. It's just the way the tax system works here, check your local laws you never know, you might start saving more on taxes. There are a lot of little known secrets for getting legal deductions.
You think it's wrong to donate the clothes. I don't see anything wrong with it. You are doing a good deed and the government is just giving you a little bit back from what you gave away. It's not like they even give you 50% of the value you originally paid. You also aren't going to donate rags to charity, even the charities will tell you they want clothes in good condition and clean. Cash donations are also deductible.
I have never meet a tax payer that was apalled by any of my legal suggestions. I understand it's always good to donate and give stuff away with no intentions of gaining financially, but you are never really gaining financially, the IRS only gives you back a certain percentage from what you donate. It could also be a cultural difference. I know a lot of people that give 10% of their salary to the church/temple and they get a receipt from their place of worship once a year and they also deduct that come tax time.
Anyway hopefully this post helped someone out.