Eh. I keep a stock of boots from https://www.balljointboots.co.uk

It's handy to keep them around, and when it comes to more rare or expensive balljoints, they've really saved my ass. But I'll always prefer to replace the whole thing if it's not expensive.

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo