Amira

Nah they aren't very fun. Only very good for dishing out quick SP, col, or materials without waiting on a second player to reply.. or for personal character development. 

Its the 20 post thing. I can right out an extremely long post for a solo, but when you have to split them into posts it get mentally tiring. I don't know about you guys, but I rp for fun. SP's aren't fun so im not gonna do them unless their absolutely necessary.

I'm right there with you. That's also why I don't do SPs unless I am bored or nobody is on. Just something to keep me busy while listening to music :P I average from 4-5 lines in my SPs I think, but they aren't super-inspired~

I prefer to RP with someone else. Thankfully there is only one quest (at the moment) that requires you play solo to kill it. And a tip, do it early on with a damage boosted weapon you don't have training for. It only gets damage from your skills xD