If fewer players were net decking, sharing lists and bringing moderately adjusted copy pasta to each pro tour then less of the player base would be playing the same deck and it wouldn't get banned.

It's okay to netdeck, Magic isn't played in a vacuum. Building a deck can be a significant investment, and you want to plan accordingly.

They aren't getting any satisfaction out of banning cards. They just want Modern to be fun, creative, and accessible.

They may not get satisfaction, but they will profit. There's a reason why Modern Masters had a limited print run, and a reason why Modern Masters 2 will have a limited print run. If people could play a competitive modern deck (e.g. at least breaking even on daily events in mtgo) on the cheap then why would anyone feel the need to crack 10$ packs? This is effectively the standard block structure, except Wizards are selling more expensive packs full of reprints that would have been prohibitively expensive otherwise. Decks are effectively rotating out of modern and customers will have to invest in the next 'block' - MMA2015.

I think sponsored events should not have public deck lists.

This is just unrealistic.

Decreasing the cost of other overplayed cards (Pod, Goyf, etc) is not a good solution to the problem.

It's not just the rares and mythics. There are plenty of 15$+ commons and uncommons in modern. This is Wizard's fault and it does make modern less accessible. This would be understandable in vintage and legacy, but not in any format that calls itself 'modern'.

The problem is excessive demand over a minority of the cards

With the demand more spread out prices will be less ridiculous, there will be less incentive to ban certain cards, and the format will me more accessible to less spikey players.

Wizards creates artificial demand by deliberately by making rare and mythic bombs that are strictly better than commons in limited supply - not to mention planeswalkers and nonbasic lands. Introducing modern they've even managed to make needed commons harder to come by. A player is forced to choose which bomb/bombs to invest in and spends a good sum of money building a deck around them. All this is to be expected as long as Wizards doesn't pull the rug out from under their customers by banning key components of 'affordable' decks.