I think you have to look at it rationally. WGT has to use the launch of a new course and the Open's to maximise revenue generation (remember they are a profit making company not a charity). Without generating this revenue, the future release of more courses becomes less likely.
Last year's conditions for qualifying were brutal and put off many from trying to qualify after their first attempt. This year they have given much tamer conditions and it has inevitably led to many more players continually trying to qualify. A "tick" for WGT cash generation then primarily through the increased sales of callaways no doubt.
Giving limited opportunities to qualify would lessen the level that non-heavy users of the game, therefore again limiting cash generation. Would it affect who qualifies; no. The best players would still make it simply by taking more care over their qualification round. It's been pointed out by many, how quickly the low scores came in and I'm 99% certain at least 125 out of the current qualifiers would've made it on this basis.
Tiered events could be a welcome addition in the future but realistically the prizes on offer wouldn't be of the standard you currently see (the tier sandbagger would have a field day). Everyone has to remember that these are their two biggest events of the year (coupled with the two biggest prizes on offer). The person who wins will be deserving of those prizes as they will have beaten the whole of the community in an open competition that everyone played from the same conditions (bar the winds; that's a whole other argument to have).
Yes, WGT's profit making tactics are fairly cold and perhaps leave a slightly sour taste for some but I don't begrudge them doing it provided the quality of their future releases doesn't diminish.