. . . you would have to have. .
(Emphasis mine)
I take small issue with that there. If your party had a paladin and a bard, the only books you have to have are
1. Players Handbook (paladin rules)
2. Players handbook II (bard rules)
Yes, all those other things are available but by no means required, and are in no way the "core rules" for for two character classes. All the other books contain additional options for these classes (feats, powers, rule options, etc) but in my experience, people rarely use all the options available in the PHB, so why spring for a bunch more? But the books are there for the people who want them.
WoTC is a publishing company. They make money when they publish books and other products/content that people buy, so yes, they are inclined to write as many books filled with as much cool stuff as they think will people buy. If you don't like WoTC or D&D 4e, that's fine, but don't go tossing out false implications like 5 books, 2 packs of minis and a subscription to a couple of magazines is somehow required to play the game when it's not.
Disney, and their friends, have quite literally raped the public domain
So, they violently and sexually assaulted the public domain? You demean yourself, your argument and countless victims rape by comparing a business you don't like to forcibly violating someone. Before you start tossing around phrases like "literally raped" why don't you ask one of the women in your life who has has actually, truly literally raped or sexually assaulted if Disney's legal opinion of copyright fairly compares to their experience. Rates of attempted or completed rape hover around 1 in 6 to 1 in 8 so it shouldn't take too long for you find someone that you know and care about who was a victim.
"Conversion, fastidious Goddess, loves blood better than brick, and feasts most subtly on the human will." -- Virginia Woolf, "Mrs. Dalloway"