Its easy to decide.
If you tiered up something to t10 and you sold it, you decided to sell the weapon for your price, you decided if that is including the tier up cost or not, you are done.
The actual owner should be compensated, he paid the price of the tier up cost when he purchased the high tier item.
Which you don't know if he did. I have no problem to sell at a lower price if it is someone I
know whos buying it, because I pay the UL stuff I buy and things I tier up with saved up
PEDs from MU of my own trades, and use ingridients from my own loot.
If I had depoed whole cost I would try to get a better price for it.
Once again, where to draw the line? High cost is quite relative. 70k might be nothing for
some while 10k is a lot for someone else.
Which item is ok to compensate and which isn't? Either all items will be compensated or non,
and that will not happen that all items will be compensated, not in PED value at least.
There is a kind of solution to it as I mentioned in an earlier post.
I don't depo unless I'm "willing" to lose it all. Others depo as an investment, at a lot higher
value, so quite understandable they get upset when losing that value due to changes,
but here is the thing with investments:
there is no guarantee it will be a positive outcome of it, it might just as well be a negative one.
As long as you don't sell the item you haven't had the loss yet. People in this situation will
probably hold on to the item longer, which means less of them are out on the market.
What happens when an item is rare on the market? Price will go up.
So the base MU value of the item will go up no matter tier level. Hopefully that will
help out at some degree, specialy if owners of certain items use them and show how
good they are in threads and posts that are not about trading. Hype it to make it popular.