I have e a KA 45 that I have been using for over 25 years that just recently needed some repair due to my negligence during mixing dough. I have also experienced this drip and for the same reasons, although not from lack of use.
Speaking with a CSR it was suggested that this could likely be resolved by running the mixer in high speed for 2 minutes to redistribute the grease in the planetary. This is the part that you see turning the beaters. Since there is only grease and no oil in these mixers the grease can settle and begin to ooze, creating what looks like oil
As for repairs. well, you are right about the expense and what have you, but not about the availability of repair parts or information on DIY for the fearless and mechanically inclined.
As I mentioned, my KA 45 needed repair and the only tech i could find wanted $65 just to look at it, plus parts and labor. i could see a $100 real quick for a $198 mixer. didn't sound like a good idea to me. So off to the I-net I went to see what I could find, and sure enough, I found a site that had the instructions, how to repair it, and where to find the parts. Go to njcrockett@gmail.com and I'll let Neil do the rest.
I'm no mechanical expert...just innately curious enough to tackle something I haven't tried before. Mechanical things intrigue me, and I have even fixed microswitches that were broken when nothing else was available. So I took my mixer apart, found not one but two gears that were damaged, and not even the one designed to break. Ordered the repair parts and fixed it. If it had been something electrical it might have been a different tune I'd be singin'!
There is only one "plastic" or nylon gear in these mixers and I believe it is still true with the new ones. The "worm" gear is designed to break if there is a resistance great enough that might be like a hand getting stuck between the beater and the bowl. The resistance could be cause by other factors as well and aren't we glad. Better it break than loose a hand.
OK. That's my story and I'm stickin' to it!