Yes unfortunately, if you are sharing IP and someone commits something to get him locked or so, eventually ALL those related to that IP gets locked.

In my opinion avoid that if you don't want to loose 70k

Use your phone's mobile AP to access jsp

What do you mean about AP ?

Application

You can't outsmart the staff, don't even try.

Access point actually, most smartphones now a days can turn their 3/4g speeds into a wifi mobile hotspot

well i'll have to talk with some old friends about not starting on d2jsp at at a later point.
and hope for none to use d2jsp on my old school. and don't use d2jsp at all on my new school.

you shouldn't have anything to worry about. The mods can see that your ip would belong to a college and can see your unique identifier to that ip. So even if someone scammed from that ip that would know it wasn't you or that you were multi. as for your friend back in 07, that shouldn't matter either, you haven't been on the same ip for years and even if he did scam you most likely wouldn't get locked since you haven't been on his ip for so long. I see no problem at all as long as you don't get yourself locked you'll be just fine.

I agree, if you have enough proof to prove who you are and who they are and that you attend that college, etc. You should be fine.