I always used to have between 25 and 50 scans stocked up (50 mil and news scans) as they were useful and running out was a pain. But back then, there was a chance that you could still get through on someone with more jammers than you had amps - it was a matter of crashing through.
These days, there isnt that chance, so if you get jammed you have to hop on IRC and look for some lonely scanner with too many resources
. So, i think the existing way of purchasing scans - instantly - suits the more precise environment that we now fight (and/or die) in.
Plus, running out was a pain
.