Yes they have. If they operated like that they wouldn't stay in business very long. They need those profits to pay the bills, pey the employees etc. They would be operating at a LOSS as they do not have money to operate the business. There is more than just the cost of manufacturing the goods.
You are missing the point.
I leave enough money to cover ALL the costs for producing an 'identical' TV. A TV that they can profit on in the same way as they would with the one I take.
Surely you agree that those costs are NOT £500, otherwise they wouldn't make any profit by selling the TV for £500.
Oh, and yeah they didn't profit on the one I took (I agree) - but don't worry, I wouldn't have bought it for £500 because I couldn't have afforded it

I was only taking it because I wanted it, but I would NEVER have bought it.

However I did leave them enough money to make a 'copy' of that TV (including all the costs to pay someone to make it, and any other costs), so don't worry they didn't 'lose out'
unless you are trying to suggest that I would need to leave £500 (or more?) for them to 'replace' the TV that I took?! Surely you're not suggesting that. I'm sure you'll agree that they can make a replacement for less than £500 - and so as long as I leave them whatever that amount is, then they can make a new 'copy' of the TV for FREE (they don't have to spend ANY of their own money to make it). They then still have a TV that they can sell for a profit, in EXACLTY the same position as before I took the original TV.
The only difference is that in the case of software the 'taker' doesn't need to leave ANY money to ensure that the 'seller' can 'replace' the 'copy' they took.
Trust me, the analogy is good. Read it carefully and I think you'll understand
/edit (added)
All you have done is started to think exactly like most software manufacturers...'We need to sell things for MORE than it costs to make, if we're to stay in business'.
So in the case of software, even though it is 'free' (ignoring development costs) to 'create' each copy of the software. They still have to sell them for more than ZERO in order to stay in business. If EVERYONE came along and said
'I wouldn't have bought it, so its ok' and
'the manufacturer isn't losing out', then they would NEVER make any profit and would go out of business.
With software piracy, people always assume that even though THEY justify it as ok, that OTHERS won't and so the software company will still get the same sales (and hence profit)!
But in my example (with a tangible item) you automatically fell into the trap that they would go out of business because
IF EVERYONE did what I did (and JUST paid enough to cover costs of making a 'replacement' set), then they would never make any profit!