Hehe, okay, okay, edit to add "being pretty well known among the [local] shadow community" ... and I never said "respected"
Very true about the level of types of runners in JP. So the 5 Street Cred would translate to 1/5 the Street Cred of a low-end Legendary character.
My reasoning was stemming from a playability standpoint of being able to introduce a PC to JP (and the related people there) in a time frame that would "seem" plausible (at least to the players, not the PCs) as 250 Karma is over 25 runs. My own bias here is that I'm looking at averaging 1 run every 2 - 3 evening sessions, so 25 runs is equaling about a year's worth of actual game time.
Regardless, even going full 250 Karma = legendary, I would say that my 3 point outline, especially with one or two runs for people already on JP, it could allow access with limitations (not able to post in major document threads, limited to "jobs wanted" forums, pay dues, perform jobs for greater access levels, etc.)...one does not simply hack into Jackpoint...you hack and wheeze and eventually cough up a lung's worth of paydata and hope they let you in as codemonkey slave and from there work your way up until people will bother to turn away from you when taking a leak.

Incorporating getting into JP into the ~25 runs helps the players feel like they're accomplishing things, which is fun for them. Watching them weep as the Wendigo's dance on their broken bodies with a "welcome to Jackpoint" invite on their commlink popping up, that's fun for the GM
