What I cannot understand is the mentality that has people saying they will no longer support a company for reasons that hvae nothing to do with the price or quality of their product.
I think you look at it from a wrong perspective.
When you buy a roleplaying game product one of the defining motivation for you is that you believe: the company that designs the game knows their game and knows their hobby well, and you can be sure that these rules are based on this knowledge.
When a such company shows they don't know that people shared rulebooks at gaming tables, and with vrtual gametables it has to work the same way so there will be PDF copying, that is one point where you question this knowledge.
When they put handouts, graphics you should show to players, etc. in a file you can't edit (so you can't only send pages) and encourage you to use it online, then sue others for sending the file for players, you might ask: Have they even considered how their game works?
Have they even considered how the numerous demo groups that promote the game can work online or offline?
The trust in the developer that makes them stand above random collection of house rules, one of the major reasons to buy a rulebook is broken.
But this isn't the only important factor. So far, I had a game where it was enough of some of the party busy the supplements (even if it was me) and it was true from day #1, with this changed, we see increased costs, AND less players who can afford it.
One of the strongest qualities for the D&D game was the huge playerbase. If less parties can afford it since WOTC no longer understands that a book is shared withing parties (even hardcopies) from day #1, then that is a rapid increase in price, and realy bad in cases of modules that could be shared between many parties are same club, etc.
AND the price increase as we see come with a smaller community so comes with a huge drop in quality.
So far people who paid for content once, thought if they can't carry all the books comfortably, accessibility of PDF (even if they don't use yet) can help if you can't play at your hometown. No more PDFs? You lost this chance, and it can hurt your chances at playing with like minden players in present and future.
And the people who bought the PDFs for this reasons can't come to your town anymore, so both sides of the coin can see this damage.
You think it ends here? Let me add one more point: So far, I knew people were willing to run demo groups online, even if they had to send pdf to players, these new players added a lot to the community, and ability to see new product lines made sure you bought product lines you can actually enjoy. This changed.