Originally Posted by
Lucavi
Pretty much. Storyline progression, at the very least, should be soloable, and since most games rarely give elite or high-quality gear from story quests, being soloable isn't a problem. If you want to make the fights tough, design capable NPCs with decent AI that can help out, assuming someone doesn't have a full party. Keep the difficulty on the world spawns, instances and raids. People that pay the monthly fee should have the ability to experience the main storyline, at the very least. This is a problem with a few games, but thankfully, some of the newer games are getting it right.