Jacob is right.
Also:
I am not talking about Magic shops, just only talking about the business of WotC.
You can't separate the two as easily as you think. If Wizards takes *any* action that will bring down the majority of the (online and real-life) card shops, they will end up hurting themselves. In the case of Vintage, it could go a little something like this:
1. WotC somehow 'bans' vintage and ends all support.
2. Card shops (secondary parties) see their income drop since Vintage cards make up for a decent portion of their turnover. Note that, while it will not be the biggest part, it is still essential to the survival of said shops due to the relatively low margins of profit and small quantities of sales of games in general.
3. The smaller card shops (the one that lack 'deep pockets') will go bankrupt.
4. As cards become harder to come by, the game becomes more and more obscure. Profit margins decrease. Go to points 2. Rinse and repeat.
Also, it is absolute nonsense that WotC doesn't make money off Vintage players. Look at the T8 lists around the world. Read Dr. Sylvan's articles. While the price of my power was high, it was a one time investment. But much like Standard players, I too am forced to buy new cards to keep up woth the ever-changing Vintage metagame.
Finally, I firmly believe that WotC has its heart in the right place. Sure, they're a company and are in it for the cash. But they
do care about vintage and their old-school player bas. To them, it is a part of history. Ignoring your own past can be a dangerous move.
The reasons why all this doesn't lead to
sponsored tournaments (please note that many vintage tourneys are sanctioned and some even run by WotC) have been discussed many times over. It is not because of a lack of interest in the format. It is not because they can't make any money off Vintage players. It is not because the format is too broken or the players too dumb. It is simply because of the limited availability of Power cards. The philosophy is that everyone should be able to play a magic tourney. For standard, there is a balance between the number of players interested in tourney play and the availability of cards. The law of supply and demand sets the prices of good cards at a reasonable figure.
For Vintage, this figure is nowhere near reasonable as it is, and were WotC to, say, make Vintage a PT format, prices would skyrocket. And so, once again, we see the discussion turning towards proxies or reprints. And please, let's not go there...
*sigh*