Synergies were added in patch 1.10. Prior to 1.10, NOBODY used sorc bots for leveling runs, cause leveling runs took place in the cow level. Sorc bots were used for magic finding, not XP runs. And people mostly used zons to clear cow level fast, since both Multishot and Lightning Fury cleared even 8 player cow games insanely fast in .09(Lightning Fury still does). 1.10 nerfed cow XP and buffed Baal XP, hence the switch to Baal runs, usually with hammerdins since they were basically god mode. There were a few sorc bots who did Baal runs, but from someone who spent a LOT of time in Baal runs, most sorcs were actually real players, botters almost always used hammerdins...though there were a couple of regular wind druid bot runners too.
And over the years, I found a few high runes. Not a ton of them, but a few. Rune drops were buffed in...1.12 I think, but the game was slowing down by then so it didn't benefit as many people. Even before the rune drop buff, I found a Cham(second rarest rune behind Zod) doing a random run through Worldstone Keep Lvl 3. Found a couple of Bers, saw a Jah drop but someone else got it, saw an Ohm drop but someone else got it, few others. Also found 3 or 4 SoJs over the years.