EnterpriseDB is something like $1700/core/year, which targets the same market - "enterprise" shops who want a vendors neck to wring when something breaks.
Honestly, SQL Server is priced very well - even enterprise edition given the features it provides. The biggest problem I have with it is T-SQL being terrible compared to pl/pgsql and the lack of developer-centric features like arrays, composite types, and a lot of other QoL features postgres has that MSSQL doesn't.
If you're going to deploy SQL Server, being able to do it on a platform that doesn't make me as a sysadmin/DevOps Engineer want to strangle myself with cluster configuration nightmares is a welcome change.
For the benefits of readers who don't know, SQL Server Standard Edition is ~$2k USD per CPU core, and Enterprise Edition is $7k.