...So if we can have something like a 10-20minute tower boot for inactivity it will aid the ENY system to be updated quicker and be more effective.
If you don't agree then at least it will be annoying for cybro to keep logging in every 10 minutes distracting him/her from what they are actually trying to achieve under their active accounts.
Troll the troll! Can't argue against a paid account, but how one uses said account should have an impact on the privilege of having an account.

At the very least, like Bruv states, there should be some annoyance or hindrance to undesirable actions in game. I'm sure one loses an account for "cheating", why not negatively impact someone for multiple account "gaming the game" schtuff.
Can't limit account per ISP because, terrible business model... But perhaps there could be some form of strike system where repeat offenders showing multiple accounts simultaniously logged onto a single arena on all countries would have some penalty imposed...
Sitting in Tower for x amount of minutes -> dot dar and bar dar go dark = no spy viability at a glance to a second computer screen. Sure they could re-up, but the point is the cheater has to be active to gain advantage rather than passive.
All three accounts from same ISP on different countries? No Dot Dar, no text chat, no bar dar, just a lovely view from your jeep...
I dunno, it's not an easy solution when part of the issue is the company is making money of this type of action. I'd have a hard time turning down cash in hand from someone willing to be a d-bag, but lawful evil with respect to game rules...