Re: Why do you play Single Player?
I'm apparently in the minority when it comes to the reasons I don't play on Bnet.
I started my D2 career in TCP/IP MP with my brother and sister-in-law. I became addicted while they moved on to other games, so I played SP. I had dial up with one of the 'free' internet companies back in the day, but was limited to only 40 hours of online time (which was later reduced down to 10 hours) and was supported by a banner ad that ran on the screen above the browser when you were online. The only way I could've played on Bnet is in windowed mode, but with the overhead from my ISP it would've been terrible.
I quit playing for a few years, then my wife bought a game called ISIS or something like that, and one of the sound effects in that game was identical to one of the effects in D2 (Can't remember which one). That sparked my memory/interest in D2, so I started playing again. A new friend of mine had played on Bnet in the past, saw me browsing the D2 forums, and started playing again online and invited me to join.
I really liked playing on bnet. I enjoy leveling, it's just like MF'ing except you gain levels instead of items. I enjoy baal running, and I liked having the overpowered runeword items (even though they were duped). I didn't have the same trouble with 'bnet kiddies', I never engaged them in conversations, so I didn't have to bother with their childishness. All of my trading was pre-arranged on these forums, so haggling was never an issue.
Once I gathered up the uber runeword hax gear, I decided to use my fortunes for the good of others. I frequently watched the games lists for 'help with xyz' and joined their game, solved their problem, moved on to the next game, earning many 'thanks' and 'gg's. I hope that I helped one of you people at some time, but I'll probably never know.
I enjoyed running for keys, as Nihlithak's temple has static maps on bnet, once you know the patterns.
Fighting the ubers is what made me quit. I probably fought them 10 times, but only about six successfully. I don't mean I died, I mean the game dropped and I lost my keys/organs/torch. It was very frustrating running for keys for several hours, fighting the lesser ubers, spawning the tristram three, then having the game drop and lose everything for the last couple hours.
I became rather addicted to bnet, playing for hours a day, staying up too late, and generally irritating my wife with my playing habits. So, I took a forced six week break. During that time, I 'rented' out my enigmadin to others on these forums by PM'ing my account password to them for a 24 hour period. Someone decided to take advantage of my generosity and stripped the character. Thus endith my bnet career. I still had a lot of fun playing for those six months.
After my six week break, I started up on SP. Even though I was a bnetter, most of my forum time was spent browsing the SPF. The community here is much more mature, helpful, informed, and friendly than other areas of this forums. I felt I fit in better here, saw the benefits of SP (as many have discussed above), and could still baalrun, MP, be helpful, and have good conversations with others via TCP/IP.
Although I never lost any runes from bnet, I don't miss them. I was eventually forcing myself to play with my friends online, once I'd made and enigmadin, I didn't see the point in making other builds on bnet. It was such a pain to mule good gear, I did lose several good pieces to realm down. I already had the 'best' 'most powerful' character and enjoyed playing him, could defeat the ubers easily, and don't care to PVP, so what was the point?
I like the tournaments here, at least reading them, I've not yet found a tournament I feel I want to compete in. I'm still having fun doing runs for my grail and using twinked gear for new builds.
Wow, that was a lot of typing, didn't think I'd do that. Sorry. In summary:
SPF= good people, good challenges, good fun.
im lucky i locked away my cds or i would start playing again. so dont give me a reason to.... 
