I would not starve for a thing in life.
One has to have a healthy understanding about things and important things - lenses are things.
There is something more important than things to me - living with a passion in photography - being passionate about a certain look, a lens can draw, no others can.
At this, a price for a lens is as long ok, as long you feel, it is worth it.
You even can pay over market value and feel good about it, as the money you paid is less important as the photographs, you create with it or the passion and give back, you can have from it holding the paper in your hand and sharing it with your loved ones and friends or even get motivation back about your photos, learning, others like, what you do.
I made a few great deals on photography equipment - deals where I got lucky or paid much less, than the gear is usually sold for now. I made some hurting bad deals as well.
When just loosing money on an item - it might not necessarily become a bad deal, as the photos, the look, you might get from the lens, might be more valuable for you, than the raw numbers on your bank account.
This numerical value is entirely different for every individual, based on income and understanding of monetary value. For some money is an unimportant thing in life.
For me it is like that - it was, when I was a construction worker, driving an old rusty Ford, starving on cheap food and is is still as a manager with regular income.