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Yeah human nature to a degree. But if you look at it rationally rather than emotionally or additively, there is no 'must have' rifle after you have lets say 4 rifles that you have spent love, time...

Yeah sort of true but cellphones get better with increases in technology so to upgrade is warranted.
Can't use the same excuse for firearms...

This I understand, the project itself can be very satisfying...but then you wouldn't consider the factors of time and money as it is a project of love.
The trouble seems to be the NEED to sell as...

Then isn't the answer (after all that time and money), NOT to get bored with them and sell them? :D