When Twitch streamers play games with their community, it's almost always free. In some cases, the only requirement is being a Twitch subscriber, which is around $6. Nobody in the history of Twitch would charge a ridiculous amount of money just to let people play with their community. They'd be laughed at for it. Community days are supposed to bring people together, show appreciation, and build goodwill, not push away the few people who actually want to participate. Hypothetically speaking, if Liv and Lindsey ever did something like that, I can already see people using alt accounts, or even their main accounts, to donate just so they could tell them how fucked up that idea is, and attack them. Charging your own community a ridiculous amount to participate in a community event would be laughable.