Dynamis wins are soloable. On pet jobs or rune fencer- I have in fact soloed Dynamis Lord on rune fencer. It doesn't mean I recommend it- the game is always more fun with other people, I'm just saying if push comes to shove, you can solo a relic (including buying some of your currency). I casually worked towards making an aegis and it took one year, farming currency a few times a week, and by doing other Gil generating content like void watch, salvage, and delve (when airlixirs were profitable).