Nope. Years ago, I had a proxy set up for this Russian dude, Mavlad, so he could play from my IP. And we played like that for years. It's not really a big deal. Although, I suppose at some point if an IMM felt bothered he'd observe you two while invis. Or perhaps if he wants to talk to you two you'll get thrown into 'the abyss' for a conversation. And here's where 1 of 2 things will happen:
1) You'll explain politely you're two people playing from the same IP. He'll be all, "good-stuff-doodz. see ya." And, you'll continue playing.
2)You can be a cunt. Throw a tantrum. Tell him he has no right. NO RIGHT! to slam you into the abyss. THE ABYSS! Tell him you're not botting and he's a stupid faggot for even thinking so and if he doesn't let you out you're gonna quit and never come back. And here's where the wizinvis immortal will reveal himself, kneel down before you, you magnificent bastard, and beg profusely for forgiveness. He'll buff all your stats, give you the blessing of the elder gully dwarf prince and emote various forms of sexual depravity onto himself in hopes that you'll keep playing, and forgive him. Forgive him above all else...
The choice is yours, buddy