It depends on how you define "worth the cost".
If it's "just a car", it's almost certainly not worth it - buy another, or upgrade to an S40.
If you have an attachment to the car, only you can answer whether or not it's worth it.
What you can't really do is ignore it - it's part of the body structure, so will spread into less desirable areas in time (unlikely, say, a door, which is "isolated"). The sooner you get it sorted out, the better...
cheers
James
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