I have never bothered, personally, even when I built more of my own prototypes myself. Hobbyists should consider their personal risk and go in increments. If you are not in a situation where setting up monitoring for exposure to flux per the NIOSH handbook is appropriate, you probably don't need much mitigation either. Putting solder assemblies at a level where flux smoke won't go up into your face is a good idea and practically free. A fan is a good idea, especially if you have one already.

If you're fixated on getting yourself a fume extractor... well, to each their own.