not saying I agree with these, but here's a couple of reasons:

* prison is part punishment - lose your freedom as a consequence of your crimes. Most probably relate to this.

* prison is to protect society from the individual - for non-violent crimes is this the optimal solution?

* prison is super expensive - will you pay extra taxes to keep this guy in jail?

* prison has a mixed record at best (and sometimes the opposite impact) at keeping people from re-offending or rehabilitating them - do you think there are programs in most/any prison tailored for white-collar tech crimes? Should there be when so few would benefit?

* Prison hurts society as a whole if the opportunity cost for the individual is high - Could this guy get a legit job, pay taxes, participate in the community?

I see the job of the legal system as weighing these factors (and more) to determine punishment. Every jurisdiction does that differently...

I'm certainly not suggesting that jailing people is always (or even often) the right course of action, but that some non-violent crimes are arguable more serious and harmful than some violent crimes, and ought to be punished accordingly.