Hello again, like the title says I really think ip-block does not have a place in a game like metin2. I understand you tried to encourage team-play to complete the runs but in reality it just meant that fewer runs will be made altogether. First of all the population of the server isn't really big(quite the opposite), secondly the playerbase is from across the globe and there are huge timezone differences hence people are having a really hard time finding common play hours.
This game is really not like any other MMORPG where you're restricted to 1 account online/IP where the core gameplay is adapted to that kind of design anyway.
So back to runs: most of the runs are really hard to do solo anyway, and even if you manage to solo it, that's really not the problem, the issue is the drop that ofcourse will have to be adapted a little but considering we have cooldowns for most runs even that shouldn't be much of an issue. Plagued Run could potentially impose a problem, but it's nothing that couldn't be adjusted.
TL;DR: IP-block is a band-aid fix that really hinders players from actually doing runs(they can't find partners and just log off or even quit altogether). If you want to promote team-play then just increase the difficulty of runs and adjust drop-rates;