Earlier quoted context omitted.
> $8 is way more than the profitability of an ad supported user. There's no excuse for "half the ads", it should be none at all. Adverse selection. The people willing to pay to remove ads are probably your most profitable users to show ads to.
The people willing to pay, the heavy users, are also the people most engaged and posting content on the platform. Content that twitter needs for less heavy users to consume, bringing in eyeballs for advertisers. Continuing to show ads to paying content creators is double-dipping.
$8 entry fee seems reasonable from a pyscological perspective. It sounds like the modern version of $9.99, since 3 numbers is taboo on the Twitter style internet and 8 sounds better than 9