I haven't been to Antarctica in a yacht but I did seriously consider it. In the end I think I made a better choice for me by paying much less and going on a 50-passenger ship (Polar Pioneer). Plenty of deck space. Great food. Solitude if you want it. We saw a couple of yachts anchored in coves during rough weather. Our big ship just cruised on, breaking through thin ice.

flying can be a gamble, which is why we chose an itinerary that was sail there/fly back. The plane was 36 hours late arrival (and was lucky to get in at all). Great for us- we got an extra 1.5 days in Antarctica. Not so good for the inbound passengers.