Multiboxing is part of EVE and many activities require multiple ships to work together. Preferably people work together to do these activities, but I do understand that it’s sometimes less boring to have an alt do the boring job, and more reliable to have an alt on stand-by instead of some other player.
Multiboxing in PvP has it’s own limits, as PvP requires quite some attention and splitting your attention will make your multiboxed ships less effective than if they were piloted by multiple players. It’s still a benefit to the multiboxer of course to fly multiple ships instead of one, but I don’t see this as an issue.
Unlike PvP, PvE can be solved and is predictable. Multiboxing in PvE is therefore much easier to do, which has impact on the value of those activities that are usually multiboxed for players who do not multibox: it makes them barely worth doing. As such, I see multiboxing in low attention PvE settings as an issue.
Multiboxing as an effect on the economy as a whole… I don’t think it has such a big effect. It’s in the same line as the PvE multiboxing question, so I should probably have answered the same thing, but it’s at a larger scale and not the entire economy is affected by a few PvE multiboxers.
Multiboxing as an effect of new player acquisition and retention: it could scare some of them off, but I don’t think the effect of multiboxing has such an impact on EVE that players with a single account are at a disadvantage. Solo players on the other hand are, but that’s easily solved by joining a corporation if you’re interested in activities that require multiple pilots.
Concern of the effect of multiboxing on other aspects: eh… not really sure. I couldn’t think of something for now, but that doesn’t mean there isn’t. For one, a cloaky camp blanket across a region is definitely enabled by multiboxing, but on the other hand I don’t think multiboxing is the problem there. For now I’ll leave this open.
A limit to multiboxing: haha no way. You’re not going to be able to limit multiboxing now and even if you did, people would find ways around it. I find the current limit (multiboxing only available to omega accounts) fair and reasonable, and it gives players a reason to stay within legitimate strategies while looking for the edges of advantage over others. Much like Plex is a good legitimate alternative to RMT. Both of these enable players to pay for their advantage in a way that CCP is paid, instead of a provider of virtual machines and VPNs, or in the case of RMT, the botters and hackers.
The only limit I could see to multiboxing is to require more attention of players for the low-attention PvE multibox activities. Not a hard limit though.
Eh, that’s a long post.
TL;DR: I think multiboxing isn’t bad and part of the game, yet I have some concerns about easily scalable PvE multiboxing.