Also, doesn't sundial cause an "end step" by ending the turn?

For example, my lifetime expenditures on MTGO from just after its inception to this January were somewhere between $1500-$2000.  Not all that uncommon to have spent on Magic in a decade. 

I sold those cards for well north of $6000.  Like, in my bank account dollars - not tickets.  And I still have enough cards to play a pretty good versions of Oath and Shops.  And practically none of that is from winnings because I'm not that good a player. And I can annecdotally give you examples of dozens of people I know who've done this.  I'm not that special.  Other people leave what I've done in the dust, ans their collections are worth many times as much but they've accomplished it through being very good. And cashing out is not hard - it might even be easier than doing so in paper.

And more importantly:

2. Online games end.  Remember City of Heroes?  Even World of Warcraft is going to shut down its servers eventually.  Once that happens, your digital cards go "poof."  With physical cards, meanwhile, you can play them with your grandkids down the road as long as you keep them dry and safe.